KVM: arm64: selftests: Test VGICv3 redistributor region retry

A failed REDIST_REGION write can remove redistributor iodevs without
clearing their cached vCPU assignments. A retry then skips those
assignments and leaves the redistributors absent from the MMIO bus.

Create two partial regions, reject a third region that overlaps the
distributor, and retry at a valid address. After initializing the VGIC,
have the guest read GICR_TYPER from all four redistributors and check their
processor numbers. This verifies the final configuration without assuming
that assignments survive the failed write.

Keep the redistributor IPAs outside the guest RAM memslot and install only
the stage-1 mappings needed for the MMIO accesses. If an iodev is missing,
KVM_RUN therefore exits with KVM_EXIT_MMIO. Without the fix, the first
redistributor access exits at 0x8030008.

Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20260831081005.41346-5-kmehltretter@gmail.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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