KVM: arm64: vgic-v3: Sanitise guest writes to GICR_INVLPIR

KVM: arm64: vgic-v3: Sanitise guest writes to GICR_INVLPIR

Make sure we filter out non-LPI invalidation when handling writes
to GICR_INVLPIR.

Fixes: 4645d11f4a553 ("KVM: arm64: vgic-v3: Implement MMIO-based LPI invalidation")
Reported-by: Alexander Potapenko <glider@google.com>
Tested-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20241117165757.247686-2-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>