board: rockchip: Add Xunlong Orange Pi 5 Plus

Xunlong Orange Pi 5 Plus is a single-board computer based on the
Rockchip RK3588 SoC. The board provides abundant interfaces, including
two HDMI output ports, one HDMI input port, two 2.5G Ethernet ports,
M.2 M-Key slot, M.2 E-Key slot, two USB 3.0, two USB 2.0, and two Type-C.

Features tested on a Orange Pi 5 Plus 4GB v1.2:
- SD-card boot
- eMMC boot
- SPI Flash boot
- PCIe/NVMe
- USB 2.0 host
- Ethernet

Device tree is imported from linux v6.7-rockchip-dts64-1 tag.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/rockchip/evb_rk3588/MAINTAINERS b/board/rockchip/evb_rk3588/MAINTAINERS
index c75f4725..2bd44bc 100644
--- a/board/rockchip/evb_rk3588/MAINTAINERS
+++ b/board/rockchip/evb_rk3588/MAINTAINERS
@@ -13,3 +13,10 @@
 F:	configs/orangepi-5-rk3588s_defconfig
 F:	arch/arm/dts/rk3588s-orangepi-5.dts
 F:	arch/arm/dts/rk3588s-orangepi-5-u-boot.dtsi
+
+ORANGEPI-5-PLUS-RK3588
+M:	Jonas Karlman <jonas@kwiboo.se>
+S:	Maintained
+F:	configs/orangepi-5-plus-rk3588_defconfig
+F:	arch/arm/dts/rk3588-orangepi-5-plus.dts
+F:	arch/arm/dts/rk3588-orangepi-5-plus-u-boot.dtsi