cm: Set IOPS mode for CFQ and BFQ automatically

 * Always set slice_idle to 0 for CFQ and BFQ (IOPS mode).
   This is a guaranteed performance boost for nonrotational storage
   and is also the new default in Linux 4.2+

Change-Id: Id271a4283219beb272c174de0e452c6c42c4e572
1 file changed