Make minimum gc sleep time tunnable

Bug: 241601436
Test: check smart idle maint log of StorageManagerService
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Change-Id: I5a70e4ec2ca895551b6446a9dfd4bb5003a3fbd0
Merged-In: I5a70e4ec2ca895551b6446a9dfd4bb5003a3fbd0
5 files changed