Add Save and Restore of BluetoothOn setting

This change will automatically save the Bluetooth On setting when
the user chooses to backup the phone settings into the cloud. This
setting is restored by the Setup Wizard (SUW) when configuring the
phone and this change will enable or disable the Bluetooth based
on this restored setting.

Bug: 35657817
Test: Manual test with Sailfish
Change-Id: Ie4518593af63f96f8c363f98941ca5260a3ec4bb
(cherry picked from commit 767f05feea)

core/java/android/provider/Settings.java

@@ -9955,7 +9955,8 @@ public final class Settings {
             CALL_AUTO_RETRY,
             DOCK_AUDIO_MEDIA_ENABLED,
             ENCODED_SURROUND_OUTPUT,
-            LOW_POWER_MODE_TRIGGER_LEVEL
+            LOW_POWER_MODE_TRIGGER_LEVEL,
+            BLUETOOTH_ON
         };
 
         private static final ContentProviderHolder sProviderHolder =