bcm63xx: DGND3700v1: fix port order

Fix the switch LAN labels for the DGND3700v1/DGND3800B router,
the order is reversed.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
[cut out of bigger patch, adjust commit title/message accordingly]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
(cherry picked from commit 583b3e40254076693eb5227a9d9ae49eb2b0bcbf)

target/linux/brcm63xx/dts/dgnd3700v1.dts

@@ -149,22 +149,22 @@
 
 			lan@1 {
 				reg = <1>;
-				label = "lan1";
+				label = "lan4";
 			};
 
 			lan@2 {
 				reg = <2>;
-				label = "lan2";
+				label = "lan3";
 			};
 
 			lan@3 {
 				reg = <3>;
-				label = "lan3";
+				label = "lan2";
 			};
 
 			lan@4 {
 				reg = <4>;
-				label = "lan4";
+				label = "lan1";
 			};
 
 			cpu@8 {