Remove the obsolete bluetooth code

Also update the shortcut:
1. Change the name to "Devices"
2. Change it point to "Connected device" page

Bug: 74806595
Fixes: 69926683
Test: robo test still pass

Change-Id: Ic57756fc955dc622cc22d0be64f02b5ae07a2915

src/com/android/settings/bluetooth/DeviceListPreferenceFragment.java

@@ -42,7 +42,6 @@ import java.util.WeakHashMap;
  * Parent class for settings fragments that contain a list of Bluetooth
  * devices.
  *
- * @see BluetoothSettings
  * @see DevicePickerFragment
  */
 // TODO: Refactor this fragment
@@ -204,10 +203,6 @@ public abstract class DeviceListPreferenceFragment extends
         mDevicePreferenceMap.put(cachedDevice, preference);
     }
 
-    /**
-     * Overridden in {@link BluetoothSettings} to add a listener.
-     * @param preference the newly added preference
-     */
     void initDevicePreference(BluetoothDevicePreference preference) {
         // Does nothing by default
     }