ARM: dts: sun7i: Add board support for LinkSprite pcDuino V3

The LinkSprite pcDuino V3 is an A20 based development board featuring
arduino compatible io headers, 1G RAM, 4G nand, sata, rtl8188cus usb wifi
and 100 Mbit ethernet using an ip101a phy:

http://www.pcduino.com/pcduino-v3/

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
[hdegoede@redhat.com: Various cleanups, correct led pins]
[hdegoede@redhat.com: Add axp209, ir and gpio-keys nodes]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>