ARM: dts: sun5i: Add dts file for inet98v_rev2 based tablets

The inet98v_rev2 is a pcb used in generic A13 based tablets. It features
volume buttons, a power barrel, micro-usb otg, headphone connector and
a power button.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>