linux-imx

KVM: arm/arm64: Extract GICv3 max APRn index calculation

As we are about to access the APRs from the GICv2 uaccess interface,
make this logic generally available.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>