Fixing the session resurrection issue in SmartspaceService. The fix re-registers callbacks after the service is bound after a restart.

Test: Built on device and tested manually
Bug:182330864
Change-Id: I0364ad0707f05e62f87c836d6e63b0134f6460a4

services/smartspace/java/com/android/server/smartspace/SmartspacePerUserService.java

@@ -406,6 +406,8 @@ public class SmartspacePerUserService extends
                         + callbackCount + " callbacks.");
             }
             service.onCreateSmartspaceSessionLocked(mSmartspaceConfig, mSessionId, token);
+            mCallbacks.broadcast(
+                    callback -> service.registerSmartspaceUpdatesLocked(mSessionId, callback));
         }
     }
 }