ARM: sun7i: dt: Enable audio codec on pcDuino V3 Nano

The pcDuino V3 Nano has a 3.5mm TRRS jack socket for audio, using the
CTIA standard pinout, connected to HPOUTL, HPOUTR, HPCOM/HPCOMFB and
MICIN1/VMIC (via appropriate RC networks) on the A20. The PH00 GPIO is
wired for headphone plug detection: it reads 0 when nothing's plugged
in, and 1 when a plug is inserted.

LINEINL/R and FMINL/R are not connected.
Signed-off-by: NAdam Sampson <ats@offog.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-pcduino3-nano.dts

@@ -82,6 +82,10 @@
 	status = "okay";
 };
 
+&codec {
+	status = "okay";
+};
+
 &cpu0 {
 	cpu-supply = <&reg_dcdc2>;
 };