KVM: arm64: switch HCRX_EL2 between host and guest

KVM: arm64: switch HCRX_EL2 between host and guest

Switch the HCRX_EL2 register between host and guest configurations, in
order to enable different features in the host and guest.

Now that there are separate guest flags, we can also remove SMPME from
the host flags, as SMPME is used for virtualizing SME priorities and has
no use in the host.

Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20230509142235.3284028-4-kristina.martsenko@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>