Now that the _PRT generates a GNB IO-APIC routing table we no longer
need to route the PCI interrupts through the FCH IO-APIC. This change
unmaps the IRQs since they are no longer used.
BUG=b:170595019
TEST=Boot with `pci=nomsi amd_iommu=off` and verify /proc/interrupts
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I3467934bfcac14311505bec49a12652490554e6a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48669
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nikolai Vyssotski <nikolai.vyssotski@amd.corp-partner.google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
55cf7088fd