Merge "Enable vold to set level from user." am: dd66de13ea am: cfc66f28b1 am: 77894409cf am: d451f0aa0d

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/1437215

Change-Id: I696092859446e246dcdff624f056bd6d2fb445ac