Auto time should show dynamic subtext when restricted.

Auto time preference should show dynamic subtext corresponding to
the current status of auto time when it's restricted, instead of
hard code "enabled by admin", as it could either be enabled or disabled
when disallow_config_date_time is set.

Bug: 73811933
Test: manually by TestDPC
Change-Id: Ia7181e8a67ccfe72117f95133e9081375c121fe3
diff --git a/res/xml/date_time_prefs.xml b/res/xml/date_time_prefs.xml
index 3249189..511b39f 100644
--- a/res/xml/date_time_prefs.xml
+++ b/res/xml/date_time_prefs.xml
@@ -30,7 +30,6 @@
             android:summaryOn="@string/date_time_auto_summaryOn"
             android:summaryOff="@string/date_time_auto_summaryOff"
             settings:useAdditionalSummary="true"
-            settings:restrictedSwitchSummary="@string/enabled_by_admin"
             settings:userRestriction="no_config_date_time" />
 
         <com.android.settingslib.RestrictedPreference