msm: vidc: refine BW voting for rotate/DS/P010

- add rotation and downscaling BW voting for encoder.
- correctly set output resolution.
- correctly calculate decoder OPB and encoder input
  BW for P010 format.

Change-Id: Idf3f7121619a12a312c78ce98c29753bec3b1899
Signed-off-by: Qiwei Liu <qiweil@codeaurora.org>