drm/hisilicon: add select HISI_KIRIN_DW_DSI

 Add select HISI_KIRIN_DW_DSI to Kconfig.
 The DRM driver depends on dsi sub-driver.

Signed-off-by: Zoltan Kuscsik <zoltan.kuscsik@linaro.org>
Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>