Revert "SurfaceFlinger: Change to support framebuffer flip for 2D blitters"

This reverts commit 4fd98f6d9d82e2bbf90701428f4978264945b7d9.
ifdef HWC_BLIT

Change-Id: If67c8ae70fadb1309990336ae97fb7da2dd62c7d

Conflicts:

	services/surfaceflinger/DisplayHardware/HWComposer.cpp
	services/surfaceflinger/Layer.cpp
	services/surfaceflinger/SurfaceFlinger.cpp