ramips: fix Archer C2 v1 5GHz MAC address

The TP-Link Archer C2 v1 previously had a generic Ralink MAC address set
for the 5GHz radio (MT7610), as the caldata does only contain a generic
MAC address.

Set the MAC address from the vendor firmware for the 5GHz radio to
assign unique MAC addresses to every device.

Signed-off-by: David Bauer <mail@david-bauer.net>
(cherry picked from commit dcc923a4c45b48fcbef4f3964f74fbcaabad335e)

target/linux/ramips/dts/ArcherC2-v1.dts

@@ -188,5 +188,7 @@
 	mt76@0,0 {
 		reg = <0x0000 0 0 0 0>;
 		mediatek,mtd-eeprom = <&radio 0x8000>;
+		mtd-mac-address = <&rom 0xf100>;
+		mtd-mac-address-increment = <(-1)>;
 	};
 };