arm64/sysreg: Add remaining GICv5 ICC_ & ICH_ sysregs for KVM support

arm64/sysreg: Add remaining GICv5 ICC_ & ICH_ sysregs for KVM support

Add the GICv5 system registers required to support native GICv5 guests
with KVM. Many of the GICv5 sysregs have already been added as part of
the host GICv5 driver, keeping this set relatively small. The
registers added in this change complete the set by adding those
required by KVM either directly (ICH_) or indirectly (FGTs for the
ICC_ sysregs).

The following system registers and their fields are added:

	ICC_APR_EL1
	ICC_HPPIR_EL1
	ICC_IAFFIDR_EL1
	ICH_APR_EL2
	ICH_CONTEXTR_EL2
	ICH_PPI_ACTIVER<n>_EL2
	ICH_PPI_DVI<n>_EL2
	ICH_PPI_ENABLER<n>_EL2
	ICH_PPI_PENDR<n>_EL2
	ICH_PPI_PRIORITYR<n>_EL2

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260319154937.3619520-7-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>