Don't delete /mnt/user/<userId>/package on reset.

We need this to stay mounted at /storage.

Bug: 124466384
Test: manual
Test: atest cts/hostsidetests/appsecurity/src/android/appsecurity/cts/ExternalStorageHostTest.java
Test: atest cts/tests/tests/provider/src/android/provider/cts/MediaStore*
Change-Id: I0cc835471ced2822d83d7056bec53d62ddc682f0
diff --git a/Utils.h b/Utils.h
index 9a1fa09..e9b1c32 100644
--- a/Utils.h
+++ b/Utils.h
@@ -140,6 +140,7 @@
 status_t UnmountTree(const std::string& mountPoint);
 
 status_t DeleteDirContentsAndDir(const std::string& pathname);
+status_t DeleteDirContents(const std::string& pathname);
 
 status_t WaitForFile(const char* filename, std::chrono::nanoseconds timeout);