Add property to describe port id updates

This will be used by the upper layers to be able to track events that
will occur for a specific port id.

Test: make
Bug: 235521198
Change-Id: If7c7fa707f9829e7b6c0fc16c4fe41bd66f8dbf4
diff --git a/include/audiomanager/AudioManager.h b/include/audiomanager/AudioManager.h
index 4aa2f60..caf13a0 100644
--- a/include/audiomanager/AudioManager.h
+++ b/include/audiomanager/AudioManager.h
@@ -38,6 +38,7 @@
     PLAYER_STATE_PAUSED   = 3,
     PLAYER_STATE_STOPPED  = 4,
     PLAYER_UPDATE_DEVICE_ID = 5,
+    PLAYER_UPDATE_PORT_ID = 6,
 } player_state_t;
 
 // must be kept in sync with definitions in AudioManager.java