drm/amdgpu: remove the ring lock v2

It's not needed any more because all access goes through the scheduler now.

v2: Update commit message.

Signed-off-by: Christian König <[email protected]>
Reviewed-by: Chunming Zhou <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
15 files changed