Use message ID from proto for BT APM notification

Bug: 239983569
Test: atest ServiceBluetoothTests

Change-Id: I109ea5b7703dbffd01b22ed1c8867a8c96b7c002
Merged-In: I109ea5b7703dbffd01b22ed1c8867a8c96b7c002

proto/src/system_messages.proto

@@ -298,6 +298,10 @@ message SystemMessage {
     // Notify the user to setup their dock
     NOTE_SETUP_DOCK = 72;
 
+    // Inform the user of bluetooth apm state changes.
+    // Package: android
+    NOTE_BT_APM_NOTIFICATION = 74;
+
     // ADD_NEW_IDS_ABOVE_THIS_LINE
     // Legacy IDs with arbitrary values appear below
     // Legacy IDs existed as stable non-conflicting constants prior to the O release