boards: nxp: mimxrt685_evk: Fix unit and first address mismatch

This fixes the following warning:

> unit address and first address in 'reg' (0x1a0000000000000000) don't
> match for /soc/peripheral@50000000/i3c@36000/wm8904@1a

Signed-off-by: Reto Schneider <[email protected]>

Author: rettichschnidi

boards/nxp/mimxrt685_evk/mimxrt685_evk_mimxrt685s_cm33.dts

@@ -393,7 +393,7 @@ zephyr_udc0: &usbhs {
 
 	status = "okay";
 
-	audio_codec: wm8904@1a {
+	audio_codec: wm8904@1a0000000000000000 {
 		compatible = "wolfson,wm8904";
 		reg = <0x1a 0 0>;