- Changed package to use android. prefix
- Added nullability flag to xsd_config
Bug: 171572311
Test: built and atest VtsHalAudioEffectV7_0TargetTest
VtsHalAudioEffectV7_0TargetTest VtsHalAudioEffectV4_0TargetTest
VtsAidlHalAudioControlTest
Change-Id: I9ac83a98256404313b5efef17c0a164d2ee72136