Synopsys Designeware PCIe IP isn't 100% ECAM compliant. It doesn't handle

Synopsys Designeware PCIe IP isn't 100% ECAM compliant.  It doesn't handle
type 0 configuration requests correctly which results in devices on bus 0
appearing multiple times.  Fix this by adding a quirk and match the
appropriate compatible string.

ok jsg@, patrick@