simplify mkDmaReadBuffers
simplify mkDmaReadBuffers

Change-Id: I651bff457ab0743c777f6de6c1406207dac9c516

chenm001/connectal,chenm001/connectal,cambridgehackers/connectal,chenm001/connectal,csail-csg/connectal,chenm001/connectal,csail-csg/connectal,cambridgehackers/connectal,csail-csg/connectal,8l/connectal,csail-csg/connectal,8l/connectal,hanw/connectal,8l/connectal,csail-csg/connectal,cambridgehackers/connectal,chenm001/connectal,hanw/connectal,cambridgehackers/connectal,hanw/connectal,8l/connectal,hanw/connectal,8l/connectal,hanw/connectal,cambridgehackers/connectal