AudioService: Unify multiple device volume selection with APM

Java selectOneAudioDevice() should match
native apm_extract_one_audio_device().
Generally cosmetic change, but could have implications
if other logic is modified.

Test: compiles
Bug: 220948052
Merged-In: Iabdf49df08a9bb3f92f0673b59ba699818746804
Change-Id: Iabdf49df08a9bb3f92f0673b59ba699818746804