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

This reverts commit 5b654fa0ec278ed6c72894fd124686a21a39c1c7.

Conflicts:

	services/surfaceflinger/DisplayHardware/HWComposer.cpp

Change-Id: Idc333b7f5b7a35d52d476126a73e9c0cb58aa666