audio VTS: Update PolicyConfig after AudioPolicyConfig

Make necessary changes to use updated AudioPolicyConfig class.

Bug: 205884982
Test: m VtsHalAudioV6_0TargetTest
Test: atest HalAudioV6_0GeneratorTest
(cherry picked from https://android-review.googlesource.com/q/commit:33a35b5ffbbcbcf8a41d70a8af807d6c16f332c9)
Merged-In: Iced9d665d018853c4b2a50f4471a545af7bf60bb
Change-Id: Iced9d665d018853c4b2a50f4471a545af7bf60bb