KVM: selftests: Add VGICv5 USERSPACE_PPIS tests

Add coverage for the VGICv5 USERSPACE_PPIS control attribute. VGICv5
only allows userspace to drive PPIs that KVM explicitly advertises, so
the selftest should verify the discovery path and the corresponding
KVM_IRQ_LINE rejection cases.

Verify that KVM reports the control attribute and that the returned
bitmap contains SW_PPI. Also check that the upper 64 bits are zero, as
KVM only exposes architected PPIs (the lower 64 entries). Finally,
verify that writes, bad userspace pointers, PPIs outside the
advertised bitmap, and the first out-of-range PPI number are rejected.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Link: https://patch.msgid.link/20260904113404.4051341-45-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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