Vendor extensions: Fix XThead* extension versions

A recent change in the XThead* extension spec repo [1]
introduced versioning on per-extension level (previously
the document had a global version for all extensions).

Let's update the vendor extension table entries accordingly
(remove the global document version and use the extension version).
To avoid links to outdated spec versions, the links to the specification
have been adjusted as well.

[1] https://github.com/T-head-Semi/thead-extension-spec/pull/19/files

Signed-off-by: Christoph Müllner <[email protected]>

Author: cmuellner

README.mkd

@@ -307,18 +307,18 @@ NOTE: Vendor prefixes are case-insensitive.
 Vendor  | Name            | Version        | ISA Document
 :------ | :-------------- | :------------- | :---------------
 SiFive  | XSFVCP          | 1.0            | [SiFive Vector Coprocessor Interface Software Specification](https://sifive.cdn.prismic.io/sifive/c3829e36-8552-41f0-a841-79945784241b_vcix-spec-software.pdf)
-T-Head  | XTheadCmo       | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadBa        | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadBb        | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadBs        | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadCondMov   | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadFMemIdx   | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadFmv       | 2.1.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.1.0/xthead-2022-11-07-2.1.0.pdf)
-T-Head  | XTheadInt       | 2.1.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.1.0/xthead-2022-11-07-2.1.0.pdf)
-T-Head  | XTheadMac       | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadMemPair   | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadMemIdx    | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
-T-Head  | XTheadSync      | 2.0.0          | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.0.0/xthead-2022-09-05-2.0.0.pdf)
+T-Head  | XTheadCmo       | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadBa        | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadBb        | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadBs        | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadCondMov   | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadFMemIdx   | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadFmv       | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadInt       | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadMac       | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadMemPair   | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadMemIdx    | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
+T-Head  | XTheadSync      | 1.0            | [T-Head ISA extension specification](https://github.com/T-head-Semi/thead-extension-spec/releases/latest)
 Ventana | XVentanaCondOps | 1.0            | [VTx-family custom instructions](https://github.com/ventanamicro/ventana-custom-extensions/releases/download/v1.0.0/ventana-custom-extensions-v1.0.0.pdf)
 
 NOTE: Vendor extension names are case-insensitive, CamelCase is used here