mm-video: swvenc: Set color format properly for different buffer types.

-Set QOMX_COLOR_FORMATYUV420PackedSemiPlanar32m as default for
 opaque color format.
-Call swvenc_set_color_format() to set color format to swvenc
 based on buffer type.

CRs-Fixed: 1071504

Change-Id: I976e27f2b799600869ec70a88bfe98c9ce7cd064
2 files changed