fix pcie core version for x7_gen3x8 vivado 2015.4
fix pcie core version for x7_gen3x8 vivado 2015.4

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