define the pci_refclk at the port rather than the output pin of the clock buffer
define the pci_refclk at the port rather than the output pin of the clock buffer

Use the port so that the name is not dependent on where in the
hierarchy the clock buffer is instantiated.

csail-csg/connectal,chenm001/connectal,cambridgehackers/connectal,hanw/connectal,hanw/connectal,hanw/connectal,cambridgehackers/connectal,hanw/connectal,hanw/connectal,csail-csg/connectal,cambridgehackers/connectal,csail-csg/connectal,chenm001/connectal,chenm001/connectal,cambridgehackers/connectal,csail-csg/connectal,chenm001/connectal,cambridgehackers/connectal,chenm001/connectal,csail-csg/connectal