ARM: sun5i: chip: Enable the audio codec

The CHIP v0.2 has a composite output on a mini-jack connector, the audio
part being provided by the on-SoC codec. Enable it.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>