The ga10h tablet has a rtl8703as wifi chip, add a dt node describing it.

This enables usage of wifi on this tablet (together with the out of
tree rtl8732bs driver).
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>