drm/amd/amdgpu/cik_sdma: Add one and remove another function param description

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

 drivers/gpu/drm/amd/amdgpu/cik_sdma.c:282: warning: Function parameter or member 'flags' not described in 'cik_sdma_ring_emit_fence'
 drivers/gpu/drm/amd/amdgpu/cik_sdma.c:282: warning: Excess function parameter 'fence' description in 'cik_sdma_ring_emit_fence'

Acked-by: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: amd-gfx@lists.freedesktop.org
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/amd/amdgpu/cik_sdma.c

@@ -271,7 +271,7 @@ static void cik_sdma_ring_emit_hdp_flush(struct amdgpu_ring *ring)
  * @ring: amdgpu ring pointer
  * @addr: address
  * @seq: sequence number
- * @fence: amdgpu fence object
+ * @flags: fence related flags
  *
  * Add a DMA fence packet to the ring to write
  * the fence seq number and DMA trap packet to generate