audio: fix switch to break or use FALLTHROUGH_INTENDED

Test: compile, sanity
Bug: 117509050
Change-Id: I9439f201b3d1f4485ab698d7bed063a02f17f8f0
Merged-In: 320fd852fb98174804e5f505773500f1cf76f3af
(cherry picked from commit 320fd852fb98174804e5f505773500f1cf76f3af)
4 files changed