Separate AIDL packages

This moves the android.media.audio.common, android.media.permission and
android.media.soundtrigger_middleware AIDL files to a their own
separate aidl_interface module for Java.

Previously, because of how the framework JAR is configured, those
files were automatically compiled into it and we had to disable Java
for this target, creating a discrepancy between C++ and Java, which
would require us to similarly diverge any dependent targets if we want
cross-language support.

As part of this change, we also had to switch from using the
FileDescriptor type to ParcelFileDescriptor, as this is the only type
supported outside of the framework JAR and is also the recommended
practice.

Test: Manual verification of basic soundtrigger functionality.
Change-Id: Ib65c19dd7c7f5433cfa527fa74bb61ac677f5cf5

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