[incfs] Space trimming for IncFS v1

Run a manual timed job that trims all files one by one on the
old version of IncFS, where it didn't do it automatically.

Bug: 183435580
Fixes: 183436717
Test: atest libincfs-test service.incremental_test
Change-Id: I57885b2826e383814822c767802f837135fd8464
diff --git a/services/incremental/IncrementalService.h b/services/incremental/IncrementalService.h
index a697305..fb6f56c 100644
--- a/services/incremental/IncrementalService.h
+++ b/services/incremental/IncrementalService.h
@@ -452,6 +452,8 @@
                                StorageLoadingProgressListener&& progressListener);
     long getMillsSinceOldestPendingRead(StorageId storage);
 
+    void trimReservedSpaceV1(const IncFsMount& ifs);
+
 private:
     const std::unique_ptr<VoldServiceWrapper> mVold;
     const std::unique_ptr<DataLoaderManagerWrapper> mDataLoaderManager;