board: rockchip: Add support for FriendlyARM NanoPi R2C Plus

The NanoPi R2C Plus is a small variant of NanoPi R2C with a on-board
eMMC flash (8G) included.

The device tree is taken from the kernel v6.5.

Signed-off-by: Tianling Shen <cnsztl@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/rockchip/evb_rk3328/MAINTAINERS b/board/rockchip/evb_rk3328/MAINTAINERS
index 8a19eb3..5fc114a 100644
--- a/board/rockchip/evb_rk3328/MAINTAINERS
+++ b/board/rockchip/evb_rk3328/MAINTAINERS
@@ -11,6 +11,12 @@
 F:      configs/nanopi-r2c-rk3328_defconfig
 F:      arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
 
+NANOPI-R2C-PLUS-RK3328
+M:      Tianling Shen <cnsztl@gmail.com>
+S:      Maintained
+F:      configs/nanopi-r2c-plus-rk3328_defconfig
+F:      arch/arm/dts/rk3328-nanopi-r2c-plus-u-boot.dtsi
+
 NANOPI-R2S-RK3328
 M:      David Bauer <mail@david-bauer.net>
 S:      Maintained