libstagefright: Avoid MPEG4 DP fallback to software decoder for MSM8x10

-Avoid MPEG4 DP fallback to software decoder for MSM8x10
 Video playback needs to happen with QCOM HW decoder.

Change-Id: I255e1d1c5a6c2508711e4408de0d537e19732b0e
CRs-Fixed: 629449