drm/amdgpu: Use the sched from entity for amdgpu_cs trace

The problem is that base sched hasn't been assigned yet at this moment,
causing something like "ring=0" all the time from trace.

mpv:cs0-3473    [002] ..... 129.047431: amdgpu_cs: ring=0, dw=48, fences=0
mpv:cs0-3473    [002] ..... 129.089125: amdgpu_cs: ring=0, dw=48, fences=0
mpv:cs0-3473    [002] ..... 129.130987: amdgpu_cs: ring=0, dw=48, fences=0
mpv:cs0-3473    [002] ..... 129.172478: amdgpu_cs: ring=0, dw=48, fences=0

Fixes: 4624459c ("drm/amdgpu: add gang submit frontend v6")
Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_trace.h

@@ -153,10 +153,10 @@ TRACE_EVENT(amdgpu_cs,
 
 	    TP_fast_assign(
 			   __entry->bo_list = p->bo_list;
-			   __entry->ring = to_amdgpu_ring(job->base.sched)->idx;
+			   __entry->ring = to_amdgpu_ring(job->base.entity->rq->sched)->idx;
 			   __entry->dw = ib->length_dw;
 			   __entry->fences = amdgpu_fence_count_emitted(
-				to_amdgpu_ring(job->base.sched));
+				to_amdgpu_ring(job->base.entity->rq->sched));
 			   ),
 	    TP_printk("bo_list=%p, ring=%u, dw=%u, fences=%u",
 		      __entry->bo_list, __entry->ring, __entry->dw,