KVM: arm64: Force HCR_EL2.E2H when ARM64_KVM_HVHE is set

Obviously, in order to be able to use VHE whilst at EL2, we need
to set HCR_EL2.E2H. Do so when ARM64_KVM_HVHE is set.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230609162200.2024064-11-maz@kernel.org


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