bmips: drop unneded cpu labels from external switches

These labels aren't needed and were accidentally added when adding external
switches support for bmips.

Fixes: 80a3ecc89489 ("bmips: add Huawei HG253s v2 support")
Fixes: 61f3c3b1eebd ("bmips: dgnd3700v2: enable external BCM53125 switch")
Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bmips/dts/bcm6362-huawei-hg253s-v2.dts

@@ -123,7 +123,6 @@
 
 			port@8 {
 				reg = <8>;
-				label = "cpu";
 
 				phy-mode = "rgmii";
 				ethernet = <&switch0port4>;

target/linux/bmips/dts/bcm6362-netgear-dgnd3700-v2.dts

@@ -186,7 +186,6 @@
 
 			port@8 {
 				reg = <8>;
-				label = "cpu";
 
 				phy-mode = "rgmii";
 				ethernet = <&switch0port4>;