omxvideoenc: Update for propose allocation
omxvideoenc: Update for propose allocation

Support for use-dmabuf use omxbufferpool and propose nBufferCountActual buffers
to upstream as no-copy mode
Add option "not_change_num_buf" into configure of pool to notify to upstream
do not change the pool and do not send more buffer than maximum number of
buffers that omxbufferpool proposed.
This new option used to handle in case v4l2src + encoder

refs #108589
Signed-off-by: Thao Luong <ef4308e16b91b9bcf00aabc74dbe961cf8111f94@rvc.renesas.com>

renesas-rcar/gst-omx,renesas-rcar/gst-omx,renesas-rcar/gst-omx