Merge branch 'pci/endpoint'

- Check doorbell SUCCESS bit in pci_endpoint_test to avoid treating some
  failures as successes (Niklas Cassel)

- Fail doorbell test when the trigger IRQ is missed (Niklas Cassel)

* pci/endpoint:
  misc: pci_endpoint_test: Fail doorbell test when the trigger IRQ is missed
  misc: pci_endpoint_test: Check SUCCESS bit for doorbell status