sun4i: Add dts and defconfig for iNet-1 based tablets

The iNet-tek iNet-1 PCB is a PCB found in various generic 10.1" 1024x600
A10 based tablets such as the Point of View Protab2 XXL and the
Cherry M1007.

This patch has been tested on both rev2 and rev5 of this board / these
tablets.

These tablets feature the usual connectors: headphone, mini hdmi,
power-barrel, mini-usb and a micro-sd slot.

The dts is identical to the dts submitted to the upstream kernel.

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