Do not use the handler for receiver broadcasts.

If the handler is busy, broadcasts may time out before even reaching the handler.

Bug: 151211883
Test: atest AppIntegrityManagerServiceImplTest
Change-Id: I4de7ffef9bb0ca8ab1db5c690b99ca37623ea833

services/core/java/com/android/server/integrity/AppIntegrityManagerServiceImpl.java

@@ -182,7 +182,7 @@ public class AppIntegrityManagerServiceImpl extends IAppIntegrityManager.Stub {
                 },
                 integrityVerificationFilter,
                 /* broadcastPermission= */ null,
-                mHandler);
+                /* scheduler= */ null);
     }
 
     @Override