Camera VTS: remove duplicate function in anonymous namespace

The anonymous namespace in camera_aidl_test.cpp contained a buggy
implementation of `matchDeviceName` can was being called into by a few
tests. This CL removes the buggy implementation and fixes the faulty
calls to call into the correct function.

Bug: 233252432
Bug: 233221359
Test: atest VtsAidlHalCameraProvider_TargetTest
Change-Id: Icfe9bbc75e38d4d23bdcf64a048120708045b639