ARM: dts: sun4i: Add Iteaduino Plus A10

Iteaduino Plus A10 is a breakout board + Itead Core A10. It features 1GB RAM,
has most of the A10 pins on a .1" header, 2 USB ports, 1 OTG USB port,
Ethernet, HDMI, SATA, Speaker/Microphone 3.5mm jacks and an SD card slot.

Signed-off-by: Josef Gajdusek <atx@atx.name>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>