stagefright: fixup video encoding for qsd8k

  *use the old non-omx avc encoder with BOARD_USE_OLD_AVC_ENCODER flag
  *skip over the bframe stuff with BOARD_NO_BFRAMES flag

Conflicts:
	media/libstagefright/Android.mk

Change-Id: Ie2e2e1cbeaa692b3bf59e04b2878b220426ec9cc

Conflicts:
	media/libstagefright/MPEG4Writer.cpp
	media/libstagefright/omx/Android.mk