msm7x30-common: Add surfaceflinger client stub

Change-Id: I36129561a24999c532ab97b266b86f934da79812

Conflicts:
	BoardConfigCommon.mk
msm7x30: use a different inclusion method for libsurfaceflinger_client stub

Change-Id: I5bb2aa1280bd5adb286982b42b4cab224208aa87

Conflicts:
	msm7x30.mk