Shifting common code between rkvdec-vp9.c and rkvdec-vdpu381-vp9.c to rkvdec-vp9-common.c
There is still some more common code which needs to be shifted, but still working on it.
This commit introduces vp9 hardware decoder present in vdpu381 on RK3588. Current testing shows that this can play until 4k@30fps - profile 0. Tested using various vp9 based videos and youtube. This is still in development phase and not production ready.
These modifications are from Detlev Casanova from collabora, who is currently developing HW stateless video decoders drivers for rk3588 and rk3576 SoC's . Using his patch for linux and ffmpeg using v4l2 requests and my patches for ffmpeg_codec2, I was able to get 4k@25 fps - 8-bit, running( HEVC and h.264) but still yet to optimise it and need to add hw decoders for vp9, av1, vp8 etc. NOTE - This is a testing build and might cause kernel panics.
