Add a new setting for Bluetooth on while driving.

This also adds a feature flag to read to see if the feature is enabled
on a given device.

Bug: 66679618
Test: Used in Settings Robotest
Change-Id: Idb892aa78f244d026a8d4b7dc104d47e0f611085
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 7403c26..b593e68 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -538,7 +538,8 @@
                  Settings.Secure.BACKUP_MANAGER_CONSTANTS,
                  Settings.Secure.KEYGUARD_SLICE_URI,
                  Settings.Secure.PARENTAL_CONTROL_ENABLED,
-                 Settings.Secure.PARENTAL_CONTROL_REDIRECT_URL);
+                 Settings.Secure.PARENTAL_CONTROL_REDIRECT_URL,
+                 Settings.Secure.BLUETOOTH_ON_WHILE_DRIVING);
 
     @Test
     public void systemSettingsBackedUpOrBlacklisted() {