audio: Parametrize effect VTS tests for V6.0

Parametrize tests to accept IEffectsFactory instance name.
Discover the instances in the test.

Bug: 141847510
Bug: 141989952
Test: atest VtsHalAudioEffectV5_0TargetTest
      atest VtsHalAudioEffectV6_0TargetTest

Change-Id: Iaf19109fc77a93b211cc3da85c21c0584d4f2b88
Merged-In: Iaf19109fc77a93b211cc3da85c21c0584d4f2b88