audio: fix switch to break or use FALLTHROUGH_INTENDED

Test: compile, sanity
Bug: 117509050
Change-Id: I9439f201b3d1f4485ab698d7bed063a02f17f8f0
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 2ffad0c..58acad3 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -5897,6 +5897,7 @@
                     case AUDIO_FORMAT_DOLBY_TRUEHD:
                     case AUDIO_FORMAT_E_AC3_JOC:
                         mSurroundFormats.insert(format);
+                        break;
                     default:
                         break;
                 }