i965_drv_video: support IA44/AI44 subpicture formats on Sandybridge

This fixes https://bugs.freedesktop.org/show_bug.cgi?id=32868Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>

i965_drv_video/i965_render.c

@@ -1995,6 +1995,7 @@ gen6_render_put_subpicture(VADriverContextP ctx,
                                         srcx, srcy, srcw, srch,
                                         destx, desty, destw, desth);
     gen6_render_emit_states(ctx, PS_SUBPIC_KERNEL);
+    i965_render_upload_image_palette(ctx, obj_subpic->image, 0xff);
     intel_batchbuffer_flush(ctx);
 }