ufs: Porting UFS driver's changes from kernel msm-4.14 to msm-kona

This is a snapshot of the UFS driver taken as of msm-4.14 commit
<3d758ed5e344> ("scsi: squash of multiple fixes for msm-4.4 kernel"). This
change contains the UFS driver's changes for merging from kernel version
msm-4.14 to msm-kona.

Change-Id: Iece7757565b2fe683956c419cf98a110c4de07f9
Signed-off-by: Can Guo <cang@codeaurora.org>