compiler-gcc: document minimum version for `__no_sanitize_coverage__`

The attribute was added in GCC 12.1.

This will simplify future cleanups, and is closer to what we do
in `compiler_attributes.h`.

Link: https://godbolt.org/z/MGbT76j6G
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>
Acked-by: Marco Elver <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dan Li <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Kumar Kartikeya Dwivedi <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Uros Bizjak <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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