scsi: ufs: Don't turn off link for few vendor devices

UFS devices from a couple of vendors have a limitation with the
number of power cycles. They can withstand only a certain amount
of power cycles.

Disable turning off the link for those devices so that we can
minimize the number of power cycles.

Change-Id: I87030f63c9312eb216b292549238455054efb706
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>