ARM: dts: sun8i: add FriendlyArm ZeroPi support

The ZeroPi is another fun board developed
by FriendlyELEC for makers,
hobbyists and fans.

ZeroPi key features
- Allwinner H3, Quad-core Cortex-A7@1.2GHz
- 256MB/512MB DDR3 RAM
- microsd slot
- 10/100/1000Mbps Ethernet
- Debug Serial Port
- DC 5V/2A 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/20201026073536.13617-2-mtwget@gmail.com