ARM: at91: enable wm8904 on at91sam9n12ek board

Enable wm8904 codec on at91sam9n12ek board, which is connect
to i2c0 bus with 0x1a as address.
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9n12ek.dts

@@ -41,6 +41,11 @@ dbgu: serial@fffff200 {
 			i2c0: i2c@f8010000 {
 				status = "okay";
 
+				wm8904: codec@1a {
+					compatible = "wm8904";
+					reg = <0x1a>;
+				};
+
 				qt1070: keyboard@1b {
 					compatible = "qt1070";
 					reg = <0x1b>;