ipq806x: Archer C2600: fix switch ports numbering

The order of LAN ports shown in Luci is reversed compared to what is
written on the case of the device.  Fix the order so that they match.

Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>

target/linux/ipq806x/base-files/etc/board.d/02_network

@@ -13,7 +13,6 @@ board=$(board_name)
 
 case "$board" in
 ap148 |\
-c2600 |\
 d7800 |\
 r7500 |\
 r7500v2 |\
@@ -22,6 +21,10 @@ vr2600v)
 	ucidef_add_switch "switch0" \
 		"1:lan" "2:lan" "3:lan" "4:lan" "6@eth1" "5:wan" "0@eth0"
 	;;
+c2600)
+	ucidef_add_switch "switch0" \
+		"1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1" "6@eth1" "5:wan" "0@eth0"
+	;;
 db149)
 	ucidef_set_interface_lan "eth1 eth2 eth3"
 	ucidef_add_switch "switch0" \