[source] ar71xx: fix switch port numbering on RB750r2 and RB750UPr2

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/aaa73fea36d71de986aacb4c4622f42d5751c881

commit aaa73fea36d71de986aacb4c4622f42d5751c881
Author: João Chaínho <joaochainho at gmail.com>
AuthorDate: Thu Aug 31 16:45:39 2017 +0100

    ar71xx: fix switch port numbering on RB750r2 and RB750UPr2
    
    This patch fixes the switch port numbering on Mikrotik RB750r2 (hEX lite) and RB750UPr2 (hEX PoE lite).
    Tested on a RB750UPr2. Maybe this patch is applicable to other devices (e.g. RB951Ui-2nD, RB952Ui-5ac2nD) but I have no way to test them.
    
    Signed-off-by: João Chaínho <joaochainho at gmail.com>
    (cherry picked from commit 61027e343025b5f47e7e79db71576e6bd5e97c1d)
---
 target/linux/ar71xx/base-files/etc/board.d/02_network | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/linux/ar71xx/base-files/etc/board.d/02_network b/target/linux/ar71xx/base-files/etc/board.d/02_network
index cb707f6..6d8a5c3 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/02_network
+++ b/target/linux/ar71xx/base-files/etc/board.d/02_network
@@ -142,6 +142,12 @@ ar71xx_setup_interfaces()
 	wrtnode2q)
 		ucidef_set_interfaces_lan_wan "eth1" "eth0"
 		;;
+	rb-750-r2|\
+	rb-750up-r2)
+		ucidef_set_interfaces_lan_wan "eth1.1" "eth0"
+		ucidef_add_switch "switch0" \
+			"0 at eth1" "1:lan:4" "2:lan:3" "3:lan:2" "4:lan:1"
+		;;
 	all0258n|\
 	all0315n|\
 	dlan-hotspot|\