scsi: ufs: don't turn off ref_clk when link is active

If UniPro link is active then ref_clk to UFS device shouldn't be
disabled during the suspend otherwise UniPro link on device will
go out of sync from host side link. This patch adds the check for
the same.

Change-Id: I826c54f0d5f261add4aa8f31336577c63747a2f6
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>