msdkdec: Add SFC codes

msdkdec: Add SFC codes

SFC refers to Scaler Format Converter, more details here:
https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-kbl-vol15-sfc.pdf
By attaching mfxExtDecVideoProcessing buffer to mfxVideoParam, decoder
can do SFC for csc and scaling.

MSDK will check if surface bitdepth equals to input when no SFC is
triggered, which means in the case of SFC, there is no need to update
surface bitdepth via gst_msdk_update_mfx_frame_info_from_mfx_video_param.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1444>