rockchip: rk3328: Add support for FriendlyARM NanoPi R2C

The NanoPi R2C is a minor variant of NanoPi R2S with the on-board NIC
chip changed from rtl8211e to yt8521s, and otherwise identical to R2S.

The device tree is taken from the kernel linux-next branch:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=004589ff9df5b75672a78b6c3c4cba93202b14c9

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 14fda46..3c46613 100644
--- a/board/rockchip/evb_rk3328/MAINTAINERS
+++ b/board/rockchip/evb_rk3328/MAINTAINERS
@@ -5,6 +5,12 @@
 F:      include/configs/evb_rk3328.h
 F:      configs/evb-rk3328_defconfig
 
+NANOPI-R2C-RK3328
+M:      Tianling Shen <cnsztl@gmail.com>
+S:      Maintained
+F:      configs/nanopi-r2c-rk3328_defconfig
+F:      arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
+
 NANOPI-R2S-RK3328
 M:      David Bauer <mail@david-bauer.net>
 S:      Maintained