ARM: dts: sun8i: h3: Add initial NanoPi R1 support

The NanoPi R1 is a complete open source board developed
by FriendlyElec for makers, hobbyists, fans and etc.

NanoPi R1 key features
- Allwinner H3, Quad-core Cortex-A7@1.2GHz
- 512MB/1GB DDR3 RAM
- 8GB eMMC
- microSD slot
- 10/100/1000M Ethernet x 1
- 10/100 Ethernet x 1
- Wifi 802.11b/g/n
- Bluetooth 4.0
- Serial Debug Port
- 5V 2A DC power-supply

Signed-off-by: Yu-Tung Chang <mtwget@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20201102100157.85801-2-mtwget@gmail.com