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
Test: m audioflinger_fuzzer
Change-Id: I25b4503d3bbfcba9d21cc5c628b76a6d025b709c