ANDROID: sdcardfs: Check stacked filesystem depth

bug: 111860541
Change-Id: Ia0a30b2b8956c4ada28981584cd8647713a1e993
Signed-off-by: Daniel Rosenberg <drosen@google.com>
(cherry picked from commit 9664bdeff388afe4749eee2332bc0cc220b6cee2)
Git-commit: 9664bdeff388afe4749eee2332bc0cc220b6cee2
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>