drm/i915/ringbuffer: Kill an annoyingly frequent debug message

This is better handled through the tracepoints and just clutters the
debug logs.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -606,7 +606,6 @@ ring_add_request(struct intel_ring_buffer *ring,
 	intel_ring_emit(ring, MI_USER_INTERRUPT);
 	intel_ring_advance(ring);
 
-	DRM_DEBUG_DRIVER("%s %d\n", ring->name, seqno);
 	*result = seqno;
 	return 0;
 }