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]>

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