sunxi: add support for Sinovoip Banana Pi M2 Plus

sunxi: add support for Sinovoip Banana Pi M2 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: Network 10/100M Ethernet RJ45 (Realtek RTL8211E)
Onboard: Network BT4.0/WiFi 802.11 b/g/n (Ampak AP6212)
Onboard header: SPI, I2C, GPIO, UART
USB 2.0: Two USB 2.0 HOST, One USB 2.0 OTG

Untested:
Audio, Video

Not working:
Bluetooth

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>