video: add support for RGBP and BGRP formats
The two RGB planar formats are used in OpenVino [1]
- gst-launch-1.0 videotestsrc ! video/x-raw,format=BGRP ! fakesink
- gst-launch-1.0 videotestsrc ! video/x-raw,format=RGBP ! fakesink
Edited by Haihao Xiang