drm/amdgpu/vcn5.0.1: rework reset handling

drm/amdgpu/vcn5.0.1: rework reset handling

Resetting VCN resets the entire tile, including jpeg.
When resetting the VCN, we need to ensure that JPEG data blocks are accessible and we also need to handle the JPEG queue.
Add a helper function to restore the JPEG queue during the VCN reset.

v2: split the jpeg helper in two, in the top helper we can stop the sched workqueues and attempt to wait for any outstanding fences.
    Then in the bottom helper, we can force completion, re-init the rings, and restart the sched workqueues (Alex)

v3: merge patches 4 and 5 into one patch (Alex)

Signed-off-by: Jesse Zhang <jesse.zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>