ARM: sunxi: Add Allwinner A31 DTSI

The Allwinner A31 SoC is a multimedia SoC powered by 4 Cortex-A7 and a
PowerVR GPU.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun6i: Add WITS Colombus A31 evaluation kit support

This platform from WITS is the evaluation board for the Allwinner A31.
It features a quad-Cortex A7, 2048MB of RAM, NAND, USB, MMC, several
UART, HDMI, a 2048 x 1536 10" screen, powered by a PowerVR, etc.

Of course, most of these peripherals aren't supported yet, but support
for those will come eventually.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: Add Allwinner A20 DTSI

The Allwinner A20 SoC is based on 2 Cortex A7, an ARM Mali GPU, and is
built to be pin-compatible with the older Allwinner A10.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: Add Olimex A20-Olinuxino-Micro support

The Olimex A20-Olinuxino is an open-hardware board based on the
Allwinner A20 SoC, with most of the pins exported on headers, a 10/100M
ethernet port, SATA, SD and uSD slots, etc.

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