ath79: really fix TP-Link Archer C7 v2 MAC address

Revert 290c54473e ("ath79: fix TP-Link Archer C7 v2 wlan1 MAC address")
which obviously aims to have a distinct MAC address per interface.

Unfortunally it doesn't match what is used by the stock firmware and we
shouldn'z use MAC Adresses not reserverd for/assigned to a particular
board.

The correct MAC adress increments for this board are:

wlan0 (5GHz) : -1
wlan1 (2.4GHz) : 0
eth1 (LAN) : 0
eth0 (WAN) : 1

Fixes: FS#408

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/ath79/base-files/etc/hotplug.d/firmware/11-ath10k-caldata

@@ -97,7 +97,7 @@ case "$FIRMWARE" in
 		;;
 	"tplink,tl-archer-c7-v2")
 		ath10kcal_extract "art" 20480 2116
-		ath10kcal_patch_mac $(macaddr_add $(cat /sys/class/net/eth1/address) -2)
+		ath10kcal_patch_mac $(macaddr_add $(cat /sys/class/net/eth1/address) -1)
 		;;
 	"ubnt,unifiac-lite"|\
 	"ubnt,unifiac-mesh"|\

target/linux/ath79/dts/qca9558_tl-archer-c7.dtsi

@@ -190,5 +190,4 @@
 	status = "okay";
 	mtd-cal-data = <&art 0x1000>;
 	mtd-mac-address = <&uboot 0x1fc00>;
-	mtd-mac-address-increment = <(-1)>;
 };