audio: Add fields belonged to APM XSD schema to HAL structs

Since APM XML configuration is being replaced with data
provided by the HAL, add data fields used to be in the APM XSD
schema to HAL structures. Summary of changes:

- Audio*Flags enum types moved to HAL types because flags
  are specified for mixPorts in the APM config;
- AudioGainSys.useForVolume -> AudioGain
- added AudioPort.flags because they are specified in the
  APM config for mixPorts; since AudioIoFlags is a union,
  it will be used for determining the mix port role;
- AudioPortConfigSys.flags -> AudioPortConfig
  this is for symmetry with AudioPort;

In C++:
- DeviceDescriptor.mEncodedFormats -> DeviceDescriptorBase
- IOProfile.max{Open|Active}Count -> AudioPort
- IOProfile.recommendedMuteDurationMs -> AudioPort

Flags are not moved out from PolicyAudioPort to AudioPort as it's
a non-trivial change.

Bug: 198812639
Test: atest audiofoundation_parcelable_test
Test: atest audiopolicy_tests
Change-Id: I7aca107f7e7f20c6cd97080327cb9e4589cbe544