Updated toggles in Date and time settings page

Design doc: go/dd-android-settings-time-2024

Changes:
- toggling off "automatic time zone" now sets "use location" off and makes it unmodifiable
- removing "use locale default" for time format

Bug: 296835792
Test: on-device and atest
Flag: com.android.settings.flags.revamp_toggles
Change-Id: I31744f104fed06ee9980a6a0160501325175a02d

aconfig/settings_datetime_flag_declarations.aconfig

@@ -9,3 +9,11 @@ flag {
     bug: "283239837"
 }
 
+flag {
+    name: "revamp_toggles"
+    # "location" is used by the Android System Time team for feature flags.
+    namespace: "location"
+    description: "Makes the use location toggle dependent on automatic time zone detection"
+    bug: "296835792"
+}
+