sun7i: Add support for the Orange Pi Mini board

The Orange Pi Mini is an A20 based development board featuring 1G RAM, HDMI,
1Gbit ethernet, USB wifi, SATA, 2 sdcard slots (use the top one for booting),
2 USB 2.0 A receptacles, a micro USB B receptacle (otg) and a 3 ring 3.5 mm
jack connector for A/V.

Also see: http://www.orangepi.org/



Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>