ar71xx: Error fix in Kernel for MR3420v2 Ethernet Switch configuration

Error in using another MDIO (AP123 platform using only one GE1 device
for eth0 and eth1) for the router mr3420v2.
?onfirmed: https://forum.openwrt.org/viewtopic.php?pid=194779#p194779

Routers in this sense are the same and the only difference is: USB
port, USB led, instead of the GPIO-switch we have GPIO-button.

Signed-off-by: Dmytro <dioptimizer@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 36036

target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr841n-v8.c

@@ -136,6 +136,8 @@ static void __init tl_ap123_setup(void)
 
 	ath79_setup_ar934x_eth_cfg(AR934X_ETH_CFG_SW_PHY_SWAP);
 
+	ath79_register_mdio(1, 0x0);
+
 	ath79_init_mac(ath79_eth0_data.mac_addr, mac, -1);
 	ath79_init_mac(ath79_eth1_data.mac_addr, mac, 0);
 
@@ -164,8 +166,6 @@ static void __init tl_wr841n_v8_setup(void)
 	ath79_register_gpio_keys_polled(1, TL_WR841NV8_KEYS_POLL_INTERVAL,
 					ARRAY_SIZE(tl_wr841n_v8_gpio_keys),
 					tl_wr841n_v8_gpio_keys);
-
-	ath79_register_mdio(1, 0x0);
 }
 
 MIPS_MACHINE(ATH79_MACH_TL_WR841N_V8, "TL-WR841N-v8", "TP-LINK TL-WR841N/ND v8",
@@ -182,8 +182,6 @@ static void __init tl_mr3420v2_setup(void)
 				ARRAY_SIZE(tl_mr3420v2_gpio_keys),
 				tl_mr3420v2_gpio_keys);
 
-	ath79_register_mdio(0, 0x0);
-
 	/* enable power for the USB port */
 	gpio_request_one(TL_MR3420V2_GPIO_USB_POWER,
 			 GPIOF_OUT_INIT_HIGH | GPIOF_EXPORT_DIR_FIXED,