KVM: arm64: gic-v5: Add GIC VDPEND hyp call

With PPIs, their state is injected via the ICH_PPI_x_EL2 system
registers. For SPIs and LPIs, there are no such registers as these
would limit the number of interrupts significantly. Instead, SPI and
LPI pending state can be managed from the hypervisor using the GIC
VDPEND instruction. This provides a way to set an SPI or LPI for a VM
as pending or non-pending, i.e., to inject interrupts into a guest.

This system instruction is only executable from EL2, and therefore
must be wrapped in a hypercall for NVHE/hVHE configurations.

With pKVM this hypercall is explicitly a no-op as we currently don't
support the combination of GICv5 and pKVM.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Link: https://patch.msgid.link/20260904113404.4051341-26-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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