KVM: selftests: Add VGICv5 LPI delivery tests

Add a two-VPE VGICv5 LPI delivery test. LPIs depend on an IST whose
base is provided by the guest through IRS_IST_BASER, which causes KVM
to allocate and provide an LPI IST to the hardware. Exercise the
virtual IRS ID registers and IST base configuration path before
checking interrupt delivery.

Back the guest's LPI IST with a dedicated userspace memslot and
identity-map it into the guest at the same IPA and VA. This lets the
guest provide that address to the emulated IRS through IRS_IST_BASER
while the host test still allocates and owns the backing memory.

Have VPE0 enable the IRS, derive a valid linear LPI IST configuration
from the virtual IRS ID registers, provide the IST base through
IRS_IST_BASER, configure one LPI for each VPE, and send an LPI to
VPE1. While the BASER is valid, attempt to change its address and
verify that the write is ignored. VPE1 consumes the first LPI and
replies with a second, which VPE0 consumes before completing the test.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Link: https://patch.msgid.link/20260904113404.4051341-48-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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