Sort imports

Having consistent import order will reduce chance of merge
conflict between internal and external master

Test: rebuild
Change-Id: I0b1a170967ddcce7f388603fd521f6ed1eeba30b

tests/robotests/src/com/android/settings/bluetooth/BluetoothDevicePreferenceTest.java

@@ -16,6 +16,7 @@
 package com.android.settings.bluetooth;
 
 import static com.google.common.truth.Truth.assertThat;
+
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;