KVM: arm64: Mark HCR.EL2.E2H RES0 when ID_AA64MMFR1_EL1.VH is zero

Enforce HCR_EL2.E2H being RES0 when VHE is disabled, so that we can
actually rely on that bit never being flipped behind our back.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20250220134907.554085-4-maz@kernel.org


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