ARM: at91: at91sam9n12ek/dt: use dt ids for wm8904

Using the device tree ids for wm8904 codec.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/at91sam9n12ek.dts b/arch/arm/boot/dts/at91sam9n12ek.dts
index 13bb24e..9575c0d 100644
--- a/arch/arm/boot/dts/at91sam9n12ek.dts
+++ b/arch/arm/boot/dts/at91sam9n12ek.dts
@@ -54,7 +54,7 @@
 				status = "okay";
 
 				wm8904: codec@1a {
-					compatible = "wm8904";
+					compatible = "wlf,wm8904";
 					reg = <0x1a>;
 					clocks = <&pck0>;
 					clock-names = "mclk";