AV1: Added support for film grain synthesis and several other fixes.

[jeffqjiangNew]

• Added film grain parameter saving and loading procedures.
• Added buffer management for film grain synthesis output.
• Fixed the corruption issue with 10-bit film grain streams. We need to set surface attributes based on pixel format when creating VAAPI surfaces.
• Added missing global motion, loop filter and segmentation parameter loading in load reference frame procedure.
• Fixed an issue with one tile streams.
• Fixed an issue with uninitialised frame header structure after frame decode.
• Fixed a bug with decode buffer status update.