MIPS: ingenic: correct unit node address

Unit node addresses should not have leading 0x:

  Warning (unit_address_format): /nemc@13410000/efuse@d0/eth-mac-addr@0x22: unit name should not have leading "0x"
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: NPaul Cercueil <paul@crapouillou.net>
Signed-off-by: NThomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/ingenic/jz4780.dtsi

@@ -510,7 +510,7 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 
-			eth0_addr: eth-mac-addr@0x22 {
+			eth0_addr: eth-mac-addr@22 {
 				reg = <0x22 0x6>;
 			};
 		};