libaudiohal@aidl: Fix port config matching in findOrCreatePortConfig

The condition for determining that there is no existing port
config was not correct.

Also, clarify the output produced by audiosystem_tests to make
it easier to analyze.

Bug: 298175108
Test: atest audiosystem_tests
Change-Id: I1ae46d99fa1617f1ad4f508a78660bb63d66be8e