drm/amd/amdgpu/amdgpu_ib: Provide docs for 'amdgpu_ib_schedule()'s 'job' param

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c:127: warning: Function parameter or member 'job' not described in 'amdgpu_ib_schedule'
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/amdgpu_ib.c

@@ -106,6 +106,7 @@ void amdgpu_ib_free(struct amdgpu_device *adev, struct amdgpu_ib *ib,
  * @ring: ring index the IB is associated with
  * @num_ibs: number of IBs to schedule
  * @ibs: IB objects to schedule
+ * @job: job to schedule
  * @f: fence created during this submission
  *
  * Schedule an IB on the associated ring (all asics).