sunxi: fix network bringup on Olinuxino Micro boards

It's the A13-based Olinuxino Micro which has only wireless interfaces. The
A20-based board is a fully-fledged one which has an ethernet interface.

Signed-off-by: Zoltan HERPAI <[email protected]>

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

@@ -17,7 +17,7 @@ sunxi_setup_interfaces()
 	lamobo,lamobo-r1)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" wan
 		;;
-	olimex,a20-olinuxino-micro)
+	olimex,a13-olinuxino-micro)
 		ucidef_set_interface_lan "wlan0"
 		;;
 	xunlong,orangepi-r1)