KVM: selftests: Add VGICv5 IRS_REGS attribute tests

Add coverage for the VGICv5 IRS_REGS attribute group. Migration needs
a userspace-visible view of the virtual IRS register state, but KVM
must expose only valid registers and reject state that cannot be
restored safely.

Verify that KVM_HAS_DEVICE_ATTR reports the IRS_REGS group before the
IRS base is configured, while register reads and writes are rejected
before VGIC initialisation. Once the VGIC is initialised, verify that
all exposed registers can be read and their values written back.

Check that bad offsets, incorrect alignment, and bad userspace
pointers are rejected. Also check ID register restore validation, idle
status register values, and IRS_IST_BASER restore handling.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Link: https://patch.msgid.link/20260904113404.4051341-43-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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