Update Model pref subtext to remove redundant prefix

Remove "Model: " prefix from the description of Model pref in
About phone > Model & hardware > Model

Test: Visual veridication
Fixes: 128622275
Change-Id: I8fb077809e13fded0370271e899163a7f4103f98

src/com/android/settings/deviceinfo/hardwareinfo/DeviceModelPreferenceController.java

@@ -39,4 +39,9 @@ public class DeviceModelPreferenceController extends HardwareInfoPreferenceContr
     public boolean isSliceable() {
         return true;
     }
+
+    @Override
+    public CharSequence getSummary() {
+        return HardwareInfoPreferenceController.getDeviceModel();
+    }
 }