ar71xx: wr940 v4/v6: correct lan interface mac address

The vendor firmware only uses two mac addresses, the mac address on the
label and the label + 1. While checking multiple devices, all labels have
even mac addresses. Concluding only 2 address are assigned to a device.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr940n-v4.c

@@ -143,7 +143,7 @@ static void __init tl_wr940n_setup(void)
 	ath79_register_mdio(0, 0x0);
 
 	ath79_init_mac(ath79_eth0_data.mac_addr, mac, 1);
-	ath79_init_mac(ath79_eth1_data.mac_addr, mac, -1);
+	ath79_init_mac(ath79_eth1_data.mac_addr, mac, 0);
 
 	ath79_switch_data.phy4_mii_en = 1;