arm64: Unconditionally override SYM_FUNC macros

Currently we only override the SYM_FUNC macros when we need to insert
BTI C into them, do this unconditionally to make it more likely that we'll
notice bugs in our override.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20211214152714.2380849-3-broonie@kernel.org


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>