KVM: arm64: nv: Load guest hyp's ZCR into EL1 state

Load the guest hypervisor's ZCR_EL2 into the corresponding EL1 register
when restoring SVE state, as ZCR_EL2 affects the VL in the hypervisor
context.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240620164653.1130714-5-oliver.upton@linux.dev


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