stagefright: Add mpeg4 dp mime to media codec list

CTS now requires that all supported types be listed within the same
<MediaCodec> xml tag. Move video/mp4v-esdp from media_codecs.xml to
media_codecs_google_video.xml to comply with this requirement.

Change-Id: I7540a60ac3a8c1e49cd18fb989a96fddb0c5b507