Fix partial user cleanup on restart

Internal volume was not available during PackageManagerService creation,
which resulted in a zombie user's folder not being cleaned after a reboot.

Add the internal volume earlier in the boot cycle so that it can be accessed
for user cleanup.

Bug: 22483086
Change-Id: I8f3ffbb25f3902d00a96d1ee2d7a79373c5e35b7
diff --git a/services/core/java/com/android/server/pm/UserManagerService.java b/services/core/java/com/android/server/pm/UserManagerService.java
index ebcbecd..264170c 100644
--- a/services/core/java/com/android/server/pm/UserManagerService.java
+++ b/services/core/java/com/android/server/pm/UserManagerService.java
@@ -246,7 +246,7 @@
                 }
                 for (int i = 0; i < partials.size(); i++) {
                     UserInfo ui = partials.get(i);
-                    Slog.w(LOG_TAG, "Removing partially created user #" + i
+                    Slog.w(LOG_TAG, "Removing partially created user " + ui.id
                             + " (name=" + ui.name + ")");
                     removeUserStateLocked(ui.id);
                 }