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>

arch/arm/boot/dts/at91sam9n12ek.dts

@@ -54,7 +54,7 @@ i2c0: i2c@f8010000 {
 				status = "okay";
 
 				wm8904: codec@1a {
-					compatible = "wm8904";
+					compatible = "wlf,wm8904";
 					reg = <0x1a>;
 					clocks = <&pck0>;
 					clock-names = "mclk";