ipq40xx: fix label MAC address for Linksys WHW03 v2

The label MAC address is written inside the case of the whw03 v2 at the bottom.

Similar fix as to the 4040 in b22d382

Signed-off-by: Florian Maurer <f.maurer@outlook.de>
Link: openwrt#17535
Signed-off-by: Robert Marko <robimarko@gmail.com>

target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4019-whw03.dtsi

@@ -8,12 +8,12 @@
 
 / {
 	aliases {
-		// TODO: Verify if the ethernet0 alias is needed
 		ethernet0 = &gmac;
 		led-boot = &led_blue;
 		led-failsafe = &led_red;
 		led-running = &led_blue;
 		led-upgrade = &led_red;
+		label-mac-device = &gmac;
 	};
 
 	soc {