dt-bindings: riscv: Add Zabha ISA extension description

Add description for the Zabha ISA extension which was ratified in April
2024.

Signed-off-by: Alexandre Ghiti <[email protected]>
Reviewed-by: Guo Ren <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Andrea Parri <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: Alexandre Ghiti

Documentation/devicetree/bindings/riscv/extensions.yaml

@@ -178,6 +178,12 @@ properties:
             as ratified at commit 4a69197e5617 ("Update to ratified state") of
             riscv-svvptc.
 
+        - const: zabha
+          description: |
+            The Zabha extension for Byte and Halfword Atomic Memory Operations
+            as ratified at commit 49f49c842ff9 ("Update to Rafified state") of
+            riscv-zabha.
+
         - const: zacas
           description: |
             The Zacas extension for Atomic Compare-and-Swap (CAS) instructions