Unblock the unmount on uninstallation.

Bug: b/153874006
Test: test PackageManagerShellCommandTest PackageManagerShellCommandIncrementalTest IncrementalServiceTest
Change-Id: I540ed36b87c40b8b58f0de727936c3efeb221198
diff --git a/services/incremental/IncrementalService.cpp b/services/incremental/IncrementalService.cpp
index 79699bb..f423119 100644
--- a/services/incremental/IncrementalService.cpp
+++ b/services/incremental/IncrementalService.cpp
@@ -1610,6 +1610,8 @@
 
     fsmStep();
 
+    mStatusCondition.notify_all();
+
     return binder::Status::ok();
 }