mseal sysmap: add arch-support txt

Add Documentation/features/core/mseal_sys_mappings/arch-support.txt

N/A: the arch is 32bits only and mseal is not supported in 32 bits,
     therefore N/A (until mseal is available in 32 bits kernel).

[[email protected]: update to v3]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jeff Xu <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Eric Dumaze <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: guoweikang <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Kevin Brodsky <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Meghana Malladi <[email protected]>
Cc: Qi Zheng <[email protected]>
Cc: Sven Schnelle <[email protected]>
Cc: Thomas Weißschuh <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: peaktocreek

Documentation/features/core/mseal_sys_mappings/arch-support.txt

@@ -0,0 +1,30 @@
+#
+# Feature name:          mseal-system-mappings
+#         Kconfig:       ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
+#         description:   arch supports mseal system mappings
+#
+    -----------------------
+    |         arch |status|
+    -----------------------
+    |       alpha: | TODO |
+    |         arc: |  N/A |
+    |         arm: |  N/A |
+    |       arm64: |  ok  |
+    |        csky: |  N/A |
+    |     hexagon: |  N/A |
+    |   loongarch: | TODO |
+    |        m68k: |  N/A |
+    |  microblaze: |  N/A |
+    |        mips: | TODO |
+    |       nios2: |  N/A |
+    |    openrisc: |  N/A |
+    |      parisc: | TODO |
+    |     powerpc: | TODO |
+    |       riscv: | TODO |
+    |        s390: |  ok  |
+    |          sh: |  N/A |
+    |       sparc: | TODO |
+    |          um: | TODO |
+    |         x86: |  ok  |
+    |      xtensa: |  N/A |
+    -----------------------