rockchop: video: mipi: Makefile: Add soc specfic driver for rk3399 mipi dsi

Add Makefile item for soc specific driver for rk3399 mipi dsi.

Signed-off-by: Eric Gao <eric.gao@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/video/rockchip/Makefile

@@ -14,5 +14,6 @@ obj-$(CONFIG_DISPLAY_ROCKCHIP_LVDS) += rk_lvds.o
 obj-hdmi-$(CONFIG_ROCKCHIP_RK3288) += rk3288_hdmi.o
 obj-hdmi-$(CONFIG_ROCKCHIP_RK3399) += rk3399_hdmi.o
 obj-$(CONFIG_DISPLAY_ROCKCHIP_HDMI) += rk_hdmi.o $(obj-hdmi-y)
-obj-$(CONFIG_DISPLAY_ROCKCHIP_MIPI) += rk_mipi.o
+obj-mipi-$(CONFIG_ROCKCHIP_RK3399) += rk3399_mipi.o
+obj-$(CONFIG_DISPLAY_ROCKCHIP_MIPI) += rk_mipi.o $(obj-mipi-y)
 endif