Merge "Convert to lower fs path for createObb()." am: c237cbc575 am: 00382980e5 am: 1e3addab7f

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1505371

Change-Id: Ifd130be166f40ef78f3122444a25daeb2f36799c