ARM: sun7i: Enable audio codec on A20-OLinuXino-Micro

The A20-OLinuXino-Micro has 3.5 mm sockets for headphone output and
microphone input.
Signed-off-by: NJonathan Liu <net147@gmail.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-olinuxino-micro.dts

@@ -85,6 +85,10 @@
 	status = "okay";
 };
 
+&codec {
+	status = "okay";
+};
+
 &ehci0 {
 	status = "okay";
 };