hwcomposer: Add HWC_BLIT compositiontype value

- HWC_BLIT this layer will be handled in the HWC, using a blit engine
- setting this will inform Surfaceflinger to flip FB_TARGET

Change-Id: I25d19ec41b57863d451c3e390109c912faf1381c
libhardware: ifdef QCOM stuff

Change-Id: I250a9d10edbe337ecb930dbe1f1988c13eb7969a
Merge remote-tracking branch 'cm/android-4.4' into android-4.4