[automerger skipped] Convert to lower fs path for createObb(). am: 772008dbca -s ours

am skip reason: Change-Id I98222bf844a6b7d8ec0d9873eddc71f61aa68c90 with SHA-1 d6a612ac20 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/13092479

Change-Id: I21651924e7b7f946aefb5e30a6d1fe17024b8e96