mips: ralink: mt7621: change DSA port labels to generic naming

Change the labels of the DSA ports to generic naming for switch ports.
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/ralink/mt7621.dtsi

@@ -357,31 +357,31 @@ ports {
 					port@0 {
 						status = "disabled";
 						reg = <0>;
-						label = "lan0";
+						label = "swp0";
 					};
 
 					port@1 {
 						status = "disabled";
 						reg = <1>;
-						label = "lan1";
+						label = "swp1";
 					};
 
 					port@2 {
 						status = "disabled";
 						reg = <2>;
-						label = "lan2";
+						label = "swp2";
 					};
 
 					port@3 {
 						status = "disabled";
 						reg = <3>;
-						label = "lan3";
+						label = "swp3";
 					};
 
 					port@4 {
 						status = "disabled";
 						reg = <4>;
-						label = "lan4";
+						label = "swp4";
 					};
 
 					port@6 {