drm/amdgpu: add amd_sched_commit

This function is to update last_emitted_v_seq and wake up the waiters.

It should be called by driver in the run_job backend function

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>