bfq: turn off slice_idle during booting

Turned off slice_idling during booting to increase total throughput
for faster boot time.

Test: cat /sys/block/sda/queue/iosched/slice_idle
Bug: 171739280
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Change-Id: Id6bb4af2582f40557afaa69c72fdf20d036da4cd
1 file changed