rockchip: gru: enable eDP display

This patch enables eDP display by:
o. setting HPD pinmux, backlight, vdd for eDP
o. setting vop mode
o. enabling VGA configs for edid

BRANCH=none
BUG=chrome-os-partner:51537
TEST=The dev screen is shown on kevin board

Change-Id: If8b07307454daa88727d317cc208d6c97de07ad7
Signed-off-by: Martin Roth <martinroth@google.com>
Original-Commit-Id: b1ad9337510f5437f691153dc68883edf273e4c7
Original-Change-Id: Id7006619b5be638b286a5402d892a5361ac1e430
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/340026
Original-Reviewed-by: Shunqian Zheng <zhengsq@rock-chips.com>
Reviewed-on: https://review.coreboot.org/14858
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/gru/Kconfig b/src/mainboard/google/gru/Kconfig
index b0ea9ff..48ae698 100644
--- a/src/mainboard/google/gru/Kconfig
+++ b/src/mainboard/google/gru/Kconfig
@@ -24,7 +24,9 @@
 	select BOARD_ROMSIZE_KB_8192
 	select COMMON_CBFS_SPI_WRAPPER
 	select HAVE_HARD_RESET
+	select MAINBOARD_DO_NATIVE_VGA_INIT
 	select MAINBOARD_HAS_CHROMEOS
+	select MAINBOARD_HAS_NATIVE_VGA_INIT
 	select SOC_ROCKCHIP_RK3399
 	select SPI_FLASH
 	select SPI_FLASH_GIGADEVICE