Settings: Refactor for new API and remove some unused references / imports

Signed-off-by: San Mehat <san@google.com>

src/com/android/settings/DisplaySettings.java

@@ -27,7 +27,6 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.media.AudioManager;
 import android.os.Bundle;
-import android.os.IMountService;
 import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.preference.CheckBoxPreference;