Fix Emulator CTS tests for Camera, Location, Sensors, Telephony

This gets all the android.app.cts.SystemFeaturesTest tests to pass.

In addition to these changes, the AVD's config.ini must indicate
an emulated front camera and no back camera.

https://code.google.com/p/android/issues/detail?id=205072

Bug: 28170202

Change-Id: I4588e7daeea034847912e9044c44edf629336c35