gpu: drm: scheduler: sched_main: Provide missing description for 'sched' paramter

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/scheduler/sched_main.c:74: warning: Function parameter or member 'sched' not described in 'drm_sched_rq_init'

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/scheduler/sched_main.c

@@ -65,6 +65,7 @@ static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb);
 /**
  * drm_sched_rq_init - initialize a given run queue struct
  *
+ * @sched: scheduler instance to associate with this run queue
  * @rq: scheduler run queue
  *
  * Initializes a scheduler runqueue.