ARM: dts: sun4i: Add touchscreen node to inet9f-rev03 tablet dts file

Add a node describing the focaltech ft5406ee8 touchscreen found on
inet-9f-rev03 / qware qw tb-g100 tablets.

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