arm64: Add missing _EL12 encodings

Some _EL12 encodings are missing. Add them.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Miguel Luis <miguel.luis@oracle.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231023095444.1587322-2-maz@kernel.org


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