Move handling of flags of audio ports to libaudiofoundation

Since the flags of an audio port are part of its configuration,
they need to be visible to HAL. Thus, expose them in AudioPort/Config
classes from libaudiofoundation.

To simplify code, removed unneeded implementation of Parcelable
interface by AudioPort and DeviceDescriptorBase.

PolicyAudioPortConfig now doesn't have any fields on its own,
only inline methods.

Bug: 198812639
Test: atest audiofoundation_parcelable_test
Test: atest audiopolicy_tests
Change-Id: I68fd6d232b7e00462866cd6240089a48ad187279