1. Use AndroidJunit4 instead of RobolectricTestRunner
2. Use ApplicationProvider instead of RuntimeEnvironment
to get context
3. Change Copy Right
4. Remove the mock of PreferenceScreen
Bug: 173340087
Test: atest CarrierPreferenceControllerTest
Change-Id: Ia0dcc9db5e99626ce0f410d62d16089e0f75e123