rockchip: rk3399: Add EAIDK-610 support

Specification
- Rockchip RK3399
- LPDDR3 4GB
- TF sd scard slot
- eMMC
- AP6255 for WiFi + BT
- Gigabit ethernet
- HDMI out
- 40 pin header
- USB 2.0 x 2
- USB 3.0 x 1
- USB 3.0 Type-C x 1 work in otg mode
- 12V DC Power supply

The dts file is sync from linux-next[0].

[0]:https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/rockchip/rk3399-eaidk-610.dts

Signed-off-by: Andy Yan <andyshrk@163.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/rockchip/evb_rk3399/MAINTAINERS b/board/rockchip/evb_rk3399/MAINTAINERS
index 25e308d..5be58f8 100644
--- a/board/rockchip/evb_rk3399/MAINTAINERS
+++ b/board/rockchip/evb_rk3399/MAINTAINERS
@@ -6,6 +6,12 @@
 F:      configs/evb-rk3399_defconfig
 F:      configs/firefly-rk3399_defconfig
 
+EAIDK-610
+M:      Andy Yan <andy.yan@rock-chips.com>
+S:      Maintained
+F:	configs/eaidk-610-rk3399_defconfig
+F:	arch/arm/dts/rk3399-eaidk-610-u-boot.dtsi
+
 KHADAS-EDGE
 M:	Nick Xie <nick@khadas.com>
 S:	Maintained