KVM: arm64: Use sanitized values in __check_override in nVHE

The nVHE EL2 code has access to sanitized values of certain idregs, so
use them directly from __check_override instead of the *_override
variants.

Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20230201103755.1398086-4-qperret@google.com


Signed-off-by: Oliver Upton <oliver.upton@linux.dev>