audio: Update default effect HAL wrapper to support V7

During this conversion, the functionality of the V7 wrapper
hasn't been tested yet. This will be done in a separate CL
that will also include required updates to the VTS tests.

Since the changes were made to the code shared with pre-V7
versions, verified that V6 HAL didn't regress.

Bug: 142480271
Test: atest VtsHalAudioEffectV6_0TargetTest
Test: m VtsHalAudioEffectV7_0TargetTest
Test: m android.hardware.audio@7.0-service.example
Change-Id: I72389c8d564596bef22b47dfdcb2e77d636ef0a3
Merged-In: I72389c8d564596bef22b47dfdcb2e77d636ef0a3