ufs: snapshot of UFS driver & PHY driver

This is a snapshot of UFS driver (host controller and PHY) taken as of
msm-4.9 commit <3d139965> ("Merge "ARM: dts: msm: Use carve-out memory
for SDM670 GPU zap shader"").

Snapshot is taken of following files:
	drivers/scsi/ufs/*
	drivers/phy/phy-qcom-ufs*
	include/uapi/scsi/ufs/*
	include/trace/events/ufs.h
	Documentation/scsi/ufs.txt
	Documentation/devicetree/bindings/ufs/*

Fixed some of the minor compilation errrors after taking the snapshot.

Change-Id: I8c48fcc4f350d8541ac3474580f5a019e8a3c0b0
Signed-off-by: Can Guo <cang@codeaurora.org>