KVM: arm/arm64: GICv4: Handle INVALL applied to a vPE

There is no need to perform an INV for each interrupt when updating
multiple interrupts.  Instead, we can rely on the final VINVALL that
gets sent to the ITS to do the work for all of them.

Acked-by: Christoffer Dall <cdall@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>