Use new dataManagementLabel AIDL in Backup Settings

1) Uses new AIDL method getDataManagementLabelForUser
2) Changes data management label type from String to CharSequence

Bug: 113856654
Test: atest $(find \
packages/apps/Settings/tests/robotests/src/com/android/settings/backup \
-name '*Test.java')

Change-Id: I2325527c67878467b96fb93de50faafe153fdb21

src/com/android/settings/backup/DataManagementPreferenceController.java

@@ -48,7 +48,7 @@ public class DataManagementPreferenceController extends BasePreferenceController
             return;
         }
         preference.setIntent(mPSCD.getManageIntent());
-        final String manageLabel = mPSCD.getManageLabel();
+        final CharSequence manageLabel = mPSCD.getManageLabel();
         if (manageLabel != null) {
             preference.setTitle(manageLabel);
         }