ramips: add wmac nodes to all mt7628/88 dts files

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/ramips/dts/LINKIT7688.dts

@@ -176,3 +176,7 @@
 	status = "okay";
 	mediatek,cd-high;
 };
+
+&wmac {
+	status = "okay";
+};

target/linux/ramips/dts/MT7628.dts

@@ -61,3 +61,7 @@
 		};
 	};
 };
+
+&wmac {
+	status = "okay";
+};

target/linux/ramips/dts/WRTNODE2.dtsi

@@ -85,3 +85,6 @@
 	status = "okay";
 };
 
+&wmac {
+	status = "okay";
+};