sunxi: add support for FriendlyARM NanoPi R1

sunxi: add support for FriendlyARM NanoPi R1

Specification:

- CPU: Allwinner H3, Quad-core Cortex-A7 Up to 1.2GHz
- DDR3 RAM: 512MB/1GB
- Network:
    10/100/1000M Ethernet x 1，
    10/100M Ethernet x 1
- WiFi: 802.11b/g/n, with SMA antenna interface
- USB Host: Type-A x2
- MicroSD Slot x 1
- MicroUSB: for OTG and power input
- Debug Serial Port: 3Pin 2.54mm pitch pin-header
- LED:
    nanopi:red:status
    nanopi:green:wan
    nanopi:green:lan
- KEY:
    reset
- Power Supply: DC 5V/2A

Installation:

- Write the image to SD Card with dd
- Boot NanoPi from the SD Card

Signed-off-by: Jayantajit Gogoi <jayanta.gogoi525@gmail.com>