enable uart7(ttymxc6) in cell overlays.

recipes-kernel/linux/linux-fslc-imx/device-tree/310-00110-0006.dts

@@ -3,20 +3,25 @@
 /dts-v1/;
 /plugin/;
 / {
-        compatible = "rigado,vesta";
+    compatible = "rigado,vesta";
 
-        /* identification */
-        part-number = "310-00110";
-        version = "0006";
+    /* identification */
+    part-number = "310-00110";
+    version = "0006";
 
-        fragment@0 {
-                target = <&verizon_cellmdm>;
-                __overlay__ {
-			status = "okay";
-			pinctrl-names = "default";
-			pinctrl-0 = <&pinctrl_vz_cellmdm>;
-		};
-
-	};
+    fragment@0 {
+        target = <&verizon_cellmdm>;
+        __overlay__ {
+            status = "okay";
+            pinctrl-names = "default";
+            pinctrl-0 = <&pinctrl_vz_cellmdm>;
+        };
+    };
 
+    fragment@1 {
+        target = <&uart7>;
+        __overlay__ {
+            status = "okay";
+        };
+    };
 };

recipes-kernel/linux/linux-fslc-imx/device-tree/310-00121-0003.dts

@@ -3,20 +3,25 @@
 /dts-v1/;
 /plugin/;
 / {
-        compatible = "rigado,vesta";
+    compatible = "rigado,vesta";
 
-        /* identification */
-        part-number = "310-00121";
-        version = "0003";
+    /* identification */
+    part-number = "310-00121";
+    version = "0003";
 
-        fragment@0 {
-                target = <&gemalto_cellmdm>;
-                __overlay__ {
-			status = "okay";
-			pinctrl-names = "default";
-			pinctrl-0 = <&pinctrl_gemalto_cellmdm>;
-		};
-
-	};
+    fragment@0 {
+        target = <&gemalto_cellmdm>;
+        __overlay__ {
+            status = "okay";
+            pinctrl-names = "default";
+            pinctrl-0 = <&pinctrl_gemalto_cellmdm>;
+        };
+    };
 
+    fragment@1 {
+        target = <&uart7>;
+        __overlay__ {
+            status = "okay";
+        };
+    };
 };