Merge "Make minimum gc sleep time tunnable" am: a5d927ba6a

Original change: https://android-review.googlesource.com/c/platform/system/vold/+/2132536

Change-Id: I3fc545927eeed476f75e5a72b373d5f6e4a92829
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>