drm/amdgpu: initialize/finalize the ring for mes queue

Iniailize/finalize the ring for mes queue which submits the command
stream to the mes-managed hardware queue.

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>