drm/rockchip: Add support for Rockchip Soc LVDS

This adds support for Rockchip soc lvds found on rk3288
Based on the patches from Mark yao and Heiko Stuebner.

Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Reviewed-by: Mark Yao <mark.yao@rock-chips.com>
Tested-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1504351737-136042-1-git-send-email-hjc@rock-chips.com
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index c41f48a..082c251 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -445,6 +445,8 @@ static int __init rockchip_drm_init(void)
 
 	num_rockchip_sub_drivers = 0;
 	ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
+	ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
+				CONFIG_ROCKCHIP_LVDS);
 	ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 				CONFIG_ROCKCHIP_ANALOGIX_DP);
 	ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);