This is a prerequisite for the GPU scheduler to make the order
of submission independent from the order of execution.

v2: properly implement the locking
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NJammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: NChunming Zhou <david1.zhou@amd.com>