arm64/sysreg: Get rid of CPACR_ELx SysregFields

There is no such thing as CPACR_ELx in the architecture.
What we have is CPACR_EL1, for which CPTR_EL12 is an accessor.

Rename CPACR_ELx_* to CPACR_EL1_*, and fix the bit of code using
these names.

Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241219173351.1123087-5-maz@kernel.org


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