arm64: mte: Add Memory Tagging Extension documentation

Memory Tagging Extension (part of the ARMv8.5 Extensions) provides
a mechanism to detect the sources of memory related errors which
may be vulnerable to exploitation, including bounds violations,
use-after-free, use-after-return, use-out-of-scope and use before
initialization errors.

Add Memory Tagging Extension documentation for the arm64 linux
kernel support.

Signed-off-by: Vincenzo Frascino <[email protected]>
Co-developed-by: Catalin Marinas <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Acked-by: Szabolcs Nagy <[email protected]>
Cc: Will Deacon <[email protected]>

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