rockchip: Enable HDMI output on rk3399 board w/ HDMI

Enable config options and console setting to respective
rk3399 board for HDMI output.

Boards supported and tested on this patch are:
- NanoPc T4
- NanoPi M4
- NanoPi Neo4
- ROC-RK3399-PC
- Rock960

Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/nanopc-t4-rk3399_defconfig b/configs/nanopc-t4-rk3399_defconfig
index 9ea9b11..607a00d 100644
--- a/configs/nanopc-t4-rk3399_defconfig
+++ b/configs/nanopc-t4-rk3399_defconfig
@@ -52,5 +52,12 @@
 CONFIG_USB_ETHER_MCS7830=y
 CONFIG_USB_ETHER_RTL8152=y
 CONFIG_USB_ETHER_SMSC95XX=y
+CONFIG_USB_KEYBOARD=y
 CONFIG_SPL_TINY_MEMSET=y
 CONFIG_ERRNO_STR=y
+CONFIG_DM_VIDEO=y
+CONFIG_VIDEO_BPP16=y
+CONFIG_VIDEO_BPP32=y
+CONFIG_DISPLAY=y
+CONFIG_VIDEO_ROCKCHIP=y
+CONFIG_DISPLAY_ROCKCHIP_HDMI=y