scsi: ufs-qcom: set device ref. clk bit

As of HW major version 2, a new bit 'UFS_DEV_REF_CLK_EN' was added
to UFS_CFG1 register which needs to be set as part of hibernate
enter/exit sequences during suspend/resume.

Change-Id: I66a6a75dc5a1cf130b1cee90ae20f9f950edfb3a
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>