Besides x, y position, width and height,
fb also need updating in async update.

Fixes: 920fffcc ("drm/mediatek: update cursors by using async atomic update")
Signed-off-by: NBibby Hsieh <bibby.hsieh@mediatek.com>
Tested-by: NEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: NCK Hu <ck.hu@mediatek.com>