rockchip: defconfig: Increase max video resolution for mipi panel

The mipi panel used on evb-rk3399 has a 1920x1200 resolution. But now
the max resolution is 1920x1080. So increase it.
Signed-off-by: NEric Gao <eric.gao@rock-chips.com>
Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

configs/evb-rk3399_defconfig

@@ -66,6 +66,7 @@ CONFIG_USB_STORAGE=y
 CONFIG_DM_VIDEO=y
 CONFIG_DISPLAY=y
 CONFIG_VIDEO_ROCKCHIP=y
+CONFIG_VIDEO_ROCKCHIP_MAX_YRES=1200
 CONFIG_DISPLAY_ROCKCHIP_MIPI=y
 CONFIG_USE_TINY_PRINTF=y
 CONFIG_ERRNO_STR=y