defconfig: msm: new flag for mediabox specific demux changes

For Mediabox project demux requires raise video frame events
only for MPEG-2 B frames and H264 non idr frames instead of all
frames. These changes are required for clock recovery & AV sync
for mediabox project.

CR's-Fixed: 2005724
Change-Id: I0c87d98b382c37381b9810b6de23267933e51c20
Signed-off-by: Udaya Bhaskara Reddy Mallavarapu <udaym@codeaurora.org>