Support getDynamicSummary in BasePreferenceController

Adds dynamic summary getter in relevant BasePreferenceControllers.
Preferece controllers that don't have dynamic summaries or which
are not yet BasePreferenceControllers are not changed right now.

Change-Id: I435ccab7758d90515583fd8ca10a9b1ef0c858b9
Fixes: 71514936
Test: robotests

src/com/android/settings/bluetooth/BluetoothDeviceRenamePreferenceController.java

@@ -67,8 +67,13 @@ public class BluetoothDeviceRenamePreferenceController extends
     }
 
     @Override
-    protected void updateDeviceName(final Preference preference, final String deviceName) {
-        preference.setSummary(deviceName);
+    protected void updateDeviceName(final Preference preference) {
+        preference.setSummary(getSummary());
+    }
+
+    @Override
+    public String getSummary() {
+        return getDeviceName();
     }
 
     @Override