Revert "hevc/rext: add support for Range extension tools"

This reverts commit ecd20861c74fd1b2258f233f1d507b3d16878a74.
Revert "hevc/rext: basic infrastructure for supporting range extension 4:2:2 and"

This reverts commit 66cb7580159e2f43c5b78918845f5631ff3ba0e2.
hevc/rext: basic infrastructure for supporting range extension
- support for 4:2:2 and 4:4:4 up to 12 bits
- add a new profile for range extension
Merge branch 'ffmpeg_patch' of https://github.com/OpenHEVC/FFmpeg.git into ffmpeg_patch