Move more types from android.media -> a.m.audio.common SAIDL

Move types that are known to be used by audio HALs
(those listed in h/i/audio/common/7.0/types.hal):

 - AudioContentType
 - AudioEncapsulationMetadataType
 - AudioEncapsulationType
 - AudioMode
 - AudioSource (renamed from AudioSourceType to
     match the name of MediaRecorder.AudioSource)
 - AudioUuid

Bug: 198812639
Test: m
Change-Id: I3331d7e3d76db50f5b3c4db57891a20e4f935ad8