arm64/asm: Remove unused assembler DAIF save/restore macros

There are no longer any users of the assembler macros for saving and
restoring DAIF so remove them to prevent further users being added, there
are C equivalents available.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221123180209.634650-3-broonie@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>