surfaceflinger: Add QCOM_HARDWARE ifdefs

Change-Id: I37e6600e316f9fa5dbf94db2c70faf602a70a85a

Conflicts:
	services/surfaceflinger/DisplayDevice.h
	services/surfaceflinger/DisplayHardware/HWComposer.cpp
	services/surfaceflinger/DisplayHardware/HWComposer.h
	services/surfaceflinger/EventThread.h
	services/surfaceflinger/SurfaceFlinger.cpp
	services/surfaceflinger/SurfaceFlinger.h