drm/amd/amdgpu/amdgpu_ttm: Add description for 'page_flags'

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

 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c:1214: warning: Function parameter or member 'page_flags' not described in 'amdgpu_ttm_tt_create'
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: Jerome Glisse <glisse@freedesktop.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_ttm.c

@@ -1317,6 +1317,7 @@ static void amdgpu_ttm_backend_destroy(struct ttm_bo_device *bdev,
  * amdgpu_ttm_tt_create - Create a ttm_tt object for a given BO
  *
  * @bo: The buffer object to create a GTT ttm_tt object around
+ * @page_flags: Page flags to be added to the ttm_tt object
  *
  * Called by ttm_tt_create().
  */