Remove hidden ArrayUtils usage in test

Internal utils are generally jarjared by connectivity jarjar rules, but
ArrayUtils is not actually statically linked into the tests, so this
makes the ConnectivityCoverageTests fail. FrameworksNetTests has been
fine because it does not use jarjar, but does not exercise updated code
because of that.

Remove usage of the hidden utility, as there are reasonable alternatives
with non-hidden APIs that avoid other breakages long-term.

Bug: 187935317
Test: atest ConnectivityCoverageTests:ConnectivityServiceTest
Change-Id: I8ed85b941c3d1028771a5ac33196b1509a95789d
1 file changed