mediatek: set mac increment to 7 for the 5G radio on OpenWrt One

Mass production units will get 16 assigned MAC addresses. This allows each phy
to spawn up to 7 VAPs which will each have unique MAC without needing the
private bit.

Signed-off-by: John Crispin <[email protected]>

target/linux/mediatek/dts/mt7981b-openwrt-one.dts

@@ -450,7 +450,7 @@
 
 	band@1 {
 		reg = <1>;
-		nvmem-cells = <&macaddr_factory_4 1>;
+		nvmem-cells = <&macaddr_factory_4 7>;
 		nvmem-cell-names = "mac-address";
 	};
 };