spatializer: fix aidl interface dependency

Create a separate library for spatializer aidl
interfaces to solve double inclusion of some dependencies
in framework.jar and services.jar

Bug: 188502620
Test: atest StrictJavaPackagesTest#testBootClasspathAndSystemServerClasspath_nonDuplicateClasses

Change-Id: I4c8a2149c650d22e335e73e73baaa361b58cda29
Merged-In: I4c8a2149c650d22e335e73e73baaa361b58cda29