Add unique notification id for setting up dream.

Test: atest NudgeToSetupDreamCallbackTest
Test: flash device and check manually
Bug: 213368707
Change-Id: Idb5837bf5b84eb4549bbe8bfc764e5bdca0f5bc2
diff --git a/proto/src/system_messages.proto b/proto/src/system_messages.proto
index 6d0eadb..196c6aa 100644
--- a/proto/src/system_messages.proto
+++ b/proto/src/system_messages.proto
@@ -279,6 +279,9 @@
     // Notify the user that a CA certificate is pending for the wifi connection.
     NOTE_SERVER_CA_CERTIFICATE = 67;
 
+    // Notify the user to set up dream
+    NOTE_SETUP_DREAM = 68;
+
     // 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