sun4i: Add defconfig and dts for inet9f-rev03 based tablets

The inet9f-rev03 pcb is specially designed for gaming tablets, such as
the qware tb-g100 tablet.

These 7" tablets feature a dpad, firebuttons and 2 joysticks on the sides
of the screen.

Besides this they have the usual connectors: power-barrel, mini usb,
mini hdmi, headphone and 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>