kselftest/arm64: Verify all different mmap MTE options

This testcase checks the different unsupported/supported options for mmap
if used with PROT_MTE memory protection flag. These checks are,

* Either pstate.tco enable or prctl PR_MTE_TCF_NONE option should not cause
  any tag mismatch faults.
* Different combinations of anonymous/file memory mmap, mprotect,
  sync/async error mode and private/shared mappings should work.
* mprotect should not be able to clear the PROT_MTE page property.

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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