Move ObservablePreferenceFragment class

Bug: 365922551
Flag: EXEMPT Move class only
Test: Presubmit
Change-Id: I17851055b09d73b95e6adaafbe96f4375d5f637e
diff --git a/Android.bp b/Android.bp
index 8b903ba..0a58ee8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -94,8 +94,10 @@
         "MediaDrmSettingsFlagsLib",
         "Settings-change-ids",
         "SettingsLib",
-        "SettingsLibDataStore",
         "SettingsLibActivityEmbedding",
+        "SettingsLibDataStore",
+        "SettingsLibMetadata",
+        "SettingsLibPreference",
         "aconfig_settings_flags_lib",
         "accessibility_settings_flags_lib",
         "contextualcards",