Create DeviceDescriptorBase.

DeviceDescriptorBase is a class that derives from AudioPort and
AudioPortConfig and contains extensions to describe a audio port that is
a hardware device. DeviceDescriptor derives from DeviceDescriptorBase
and contains policy related stuff.

Test: atest AudioTrackTest AudioRecordTest AudioManagerTest
Test: atest AudioPlaybackCaptureTest AudioHostTest audiopolicy_tests
Test: audio smoke test
Bug: 135621476
Change-Id: I70ebe6bca70a77bbfc8f6855de3fd4c4ffa1c487