ARM: dts: sun8i-h3: orange-pi-2: Enable audio codec

The Orange Pi 2 routes the LINEOUT pins through a SGM8900 PA which
needs to be enabled. The onboard microphone is routed to MIC1, with
MBIAS providing power.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>