ar71xx: fix MAC address setup for TL-WDR4300 board

The current ethernet MAC address setup of TL-WDR4300 board is different
from the setup of stock firmware:

OpenWrt: lan = label_mac -2, wan = label_mac -2
  stock: lan = label_mac,    wan = label_mac +1

This patch applies to all devices using TL-WDR4300 board:
TL-WDR3600 v1
TL-WDR4300 v1
TL-WDR4300 v1 (IL)
TL-WDR4310 v1
Mercury MW4530R v1

Signed-off-by: Sungbo Eo <mans0n@gorani.run>

target/linux/ar71xx/base-files/etc/board.d/02_network

@@ -633,6 +633,10 @@ ar71xx_setup_macs()
 	fritz300e)
 		lan_mac=$(fritz_tffs -n maca -i $(find_mtd_part "tffs (1)"))
 		;;
+	tl-wdr4300)
+		base_mac=$(mtd_get_mac_binary u-boot 0x1fc00)
+		wan_mac=$(macaddr_add "$base_mac" 1)
+		;;
 	tl-wr1043n-v5|\
 	tl-wr1043nd-v4)
 		lan_mac=$(mtd_get_mac_binary product-info 0x8)

target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wdr4300.c

@@ -183,7 +183,7 @@ static void __init wdr4300_setup(void)
 
 	ath79_register_mdio(0, 0x0);
 
-	ath79_init_mac(ath79_eth0_data.mac_addr, mac, -2);
+	ath79_init_mac(ath79_eth0_data.mac_addr, mac, 0);
 
 	/* GMAC0 is connected to an AR8327N switch */
 	ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_RGMII;