ramips: remove leading zeros from MAC address location

Cosmetic adjustment to match the rest of the target.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ramips/dts/mt7620a_zyxel_keenetic-viva.dts

@@ -139,7 +139,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&rgmii2_pins &mdio_pins>;
 
-	mtd-mac-address = <&factory 0x00004>;
+	mtd-mac-address = <&factory 0x4>;
 
 	port@4 {
 		status = "okay";

target/linux/ramips/dts/rt3662_edimax_br-6475nd.dts

@@ -142,7 +142,7 @@
 
 &ethernet {
 	status = "okay";
-	mtd-mac-address = <&devdata 0x0d>;
+	mtd-mac-address = <&devdata 0xd>;
 
 	port@0 {
 		mediatek,fixed-link = <1000 1 1 1>;