drm/amdgpu: fix incorrect amd-staging-drm-next merge

Looks like some code got lost in the 6.1 merge, re-add it.

Not for upstreaming!

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

drivers/gpu/drm/amd/amdgpu/amdgpu_job.c

@@ -256,6 +256,9 @@ amdgpu_job_prepare_job(struct drm_sched_job *sched_job,
 	struct dma_fence *fence = NULL;
 	int r;
 
+	if (job->gang_submit)
+		fence = amdgpu_device_switch_gang(ring->adev, job->gang_submit);
+
 	while (!fence && job->vm && !job->vmid) {
 		r = amdgpu_vmid_grab(job->vm, ring, job, &fence);
 		if (r)