Simplify method management for IAudioService

Move all the methods called from native to the beginning,
so adding new Java-only methods does not affect transaction IDs
of methods called from native.

Also, remove unused imports from IAudioService.aidl

Bug: 72256604
Test: Loopback test in Java, OpenSL ES, and AAudio modes
Change-Id: Icc89e3ed7a052c26eb0e72ba31e3a4a973bcfd35
1 file changed