Removing race condition accessing shared binder object.

Test: incrementally installing two apks at the same time
Bug: b/150411019
Change-Id: I81231edf7a32470542ec529aa305b4f9fb2b80e3
diff --git a/services/incremental/IncrementalService.cpp b/services/incremental/IncrementalService.cpp
index 7275936..e452415 100644
--- a/services/incremental/IncrementalService.cpp
+++ b/services/incremental/IncrementalService.cpp
@@ -941,7 +941,7 @@
     if (!dataloader) {
         return false;
     }
-    status = dataloader->start();
+    status = dataloader->start(mountId);
     if (!status.isOk()) {
         return false;
     }