ANDROID: KVM: arm64: Move vgic state between host and shadow vcpu structures

Now that protected VMs have a shadow state maintained at EL2 in nVHE
protected mode, make sure to sync and flush the vgic state between host
and hyp data structure upon entry and exit from a guest.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Bug: 209580772
Change-Id: I8d7ab950041a5cd79217c9ee0e04742a27439a99
Signed-off-by: Will Deacon <willdeacon@google.com>