added rule to build examples/hdmidisplay to  gralloc Makefile
added rule to build examples/hdmidisplay to  gralloc Makefile

Change-Id: Ib579e8db6d4b5b11ec527b527285396ec9fb4b30

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