merge in Chanwoo's fixes to mkPhysMemMaster for Axi4MasterBits
merge in Chanwoo's fixes to mkPhysMemMaster for Axi4MasterBits

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