[MMFMWK-7883]Update for gplay not set video-sink by default

- Combine gstimxcommon.c into gstimxcommon.h
- Move gstimxcommon.h into gst-plugins-base
- Add gstimx.h for not common function header
- Update overlaysink, using "video-direction" property for master display
- Update imxv4l2sink, using "video-direction" property instead of "rotate"
- in gplay not set default video-sink

 Signed-off-by: Lyon Wang <lyon.wang@nxp.com>
9 files changed