sunxi: add support for Orange Pi PC Plus

CPU: H3 Quad-core Cortex-A7 H.265/HEVC 4K @ 1.2 Ghz
GPU: Mali400MP2 GPU @ 600MHz (supports OpenGL ES 2.0)
Memory: 1GB DDR3 (shared with GPU)
Onboard: Storage TF card (Max. 64GB) / MMC card slot
Onboard: Storage 8 GB eMMC
Onboard: Network 10/100M Ethernet RJ45
Onboard: Network WiFi 802.11 b/g/n (Realtek RTL8189FTV)
Onboard header: SPI, I2C, GPIO, UART
USB 2.0: Three USB 2.0 HOST, One USB 2.0 OTG

Known issues:
-Wifi diesn't work

Signed-off-by: Aleksander Jan Bajkowski <A.Bajkowski@stud.elka.pw.edu.pl>