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/PrivacySettingsUtils.java

@@ -97,7 +97,8 @@ public class PrivacySettingsUtils {
             data.setConfigSummary(backupManager.getDestinationString(transport));
             data.setManageIntent(validatedActivityIntent(context,
                     backupManager.getDataManagementIntent(transport), "management"));
-            data.setManageLabel(backupManager.getDataManagementLabel(transport));
+            data.setManageLabel(
+                    backupManager.getDataManagementLabelForUser(UserHandle.myUserId(), transport));
             data.setBackupGray(false);
         } catch (RemoteException e) {
             // leave it 'false' and disable the UI; there's no backup manager