ARM: dts: sun4i: gemei-g9: Enable sun4i audio codec support

Gemei G9 has internal speakers and headphone jack. Audio switching
from internal speakers to headphones is automatically handled by
extra FT2012Q audio amplifier chip that works out of the box.

Signed-off-by: Priit Laes <plaes@plaes.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>