Add test config to CarrierConfigTests

Details about test configs changes are tracked in doc
https://docs.google.com/document/d/1EWUjJ7fjy8ge_Nk0YQbFdRp8DSHo3z6GU0R8jLgrAcw/edit#

Bug: 35882476
Test: local test

Change-Id: I73404d3aa752b2f103613fea74225710220ca268
1 file changed