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/arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi b/arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
new file mode 100644
index 0000000..2ab32cf
--- /dev/null
+++ b/arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "rk3328-nanopi-r2s-u-boot.dtsi"