DashCodec: Changes to bringup DASH on MR2

*Disable AMR_WB audio support.
*Remove OMX_QCOM_COLOR_FormatYUV420PackedSemiPlanar32m from supported
 output color format

Change-Id: I4e675199a7e012d81f71dc027baa722b5eaa5281

Conflicts:
	modules/media/dashplayer/DashCodec.cpp