realtek: rtl838x: label switch port dts nodes

Although PHY nodes are labeled, the port nodes were not. Labeling of
ports is useful for 'status = "disabled"' ports, which is supported
since commit 9a7f17e11f ("realtek: ignore disabled switch ports")

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

target/linux/realtek/dts-5.10/rtl838x.dtsi

@@ -37,7 +37,7 @@
 	};
 
 #define SWITCH_PORT(n, s, m) \
-	port@##n { \
+	port##n: port@##n { \
 		reg = <##n>; \
 		label = SWITCH_PORT_LABEL(s) ; \
 		phy-handle = <&phy##n>; \
@@ -45,7 +45,7 @@
 	};
 
 #define SWITCH_SFP_PORT(n, s, m) \
-	port@##n { \
+	port##n: port@##n { \
 		reg = <##n>; \
 		label = SWITCH_PORT_LABEL(s) ; \
 		phy-handle = <&phy##n>; \