KVM: arm/arm64: vgic-new: Add GICv3 CTLR, IIDR, TYPER handlers

As in the GICv2 emulation we handle those three registers in one
function.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>