kselftest/arm64: Check forked child mte memory accessibility

This test covers the mte memory behaviour of the forked process with
different mapping properties and flags. It checks that all bytes of
forked child memory are accessible with the same tag as that of the
parent and memory accessed outside the tag range causes fault to
occur.

Co-developed-by: Gabor Kertesz <[email protected]>
Signed-off-by: Gabor Kertesz <[email protected]>
Signed-off-by: Amit Daniel Kachhap <[email protected]>
Tested-by: Catalin Marinas <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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