KVM: arm64: rename functions for invariant sys regs

KVM: arm64: rename functions for invariant sys regs

Invariant system id registers are populated with host values
at initialization time using their .reset function cb.

These are currently called get_* which is usually used by
the functions implementing the .get_user callback.

Change their function names to reset_* to reflect what they
are used for.

Signed-off-by: Sebastian Ott <sebott@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20240619174036.483943-10-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>