drm/amdgpu: drop the extra fence range check v2

Amdgpu doesn't support using scratch registers for fences any more.
So we won't see values like 0xdeadbeef as fence value any more.

v2: reschedule timer even if no change detected
Signed-off-by: NChristian König <christian.koenig@amd.com>
Acked-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NChunming Zhou <david1.zhou@amd.com>

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

@@ -190,9 +190,6 @@ void amdgpu_fence_process(struct amdgpu_ring *ring)
 			seq |= last_emitted & 0xffffffff00000000LL;
 		}
 
-		if (seq <= last_seq || seq > last_emitted)
-			return;
-
 	} while (atomic64_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
 
 	if (seq < last_emitted)