audio policy: removed raw pointers.

Use only RefBase objects for the following classes:
- AudioOutputDescriptor
- AudioInputDescriptor
- HwModule
- EffectDescriptor

Create a common base class AudioPortConfig for:
AudioOutputDescriptor, AudioInputDescriptor and DeviceDescriptor

Bug: 14815883.

Change-Id: I1bd193ef1020780d8b94c13142029903615aba97
2 files changed