board: rockchip: Add Radxa E25 Carrier Board

Radxa E25 is a network application carrier board for the Radxa CM3I SoM
with a RK3568 SoC. It features dual 2.5G ethernet, mini PCIe, M.2 B Key,
USB3, eMMC, SD, nano SIM card slot and a 26-pin GPIO header.

Features tested on a Radxa E25 v1.4:
- SD-card boot
- eMMC boot
- USB host
- PCIe/Ethernet adapters is detected
- SATA

Device tree is imported from linux next-20230728.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: FUKAUMI Naoki <naoki@radxa.com>
diff --git a/board/rockchip/evb_rk3568/MAINTAINERS b/board/rockchip/evb_rk3568/MAINTAINERS
index a8ed250..82a92b8 100644
--- a/board/rockchip/evb_rk3568/MAINTAINERS
+++ b/board/rockchip/evb_rk3568/MAINTAINERS
@@ -27,6 +27,14 @@
 S:	Maintained
 F:	configs/radxa-cm3-io-rk3566_defconfig
 
+RADXA-E25
+M:	Jonas Karlman <jonas@kwiboo.se>
+S:	Maintained
+F:	configs/radxa-e25-rk3568_defconfig
+F:	arch/arm/dts/rk3568-radxa-cm3i.dtsi
+F:	arch/arm/dts/rk3568-radxa-e25.dts
+F:	arch/arm/dts/rk3568-radxa-e25-u-boot.dtsi
+
 ROCK-3A
 M:      Akash Gajjar <gajjar04akash@gmail.com>
 S:      Maintained