drivers: ufs: synchronize upstream code

Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Change-Id: Ie8d0a0915e290b0e6d134a0d84653d63ae695914

ufs: backport ufs from upstream

Add ufs directory and cover some SCSI interface to fit for current
SCSI model.

Change-Id: I24c13fc494b1596905d9397a551b10f965dcb4dd
Signed-off-by: Shawn Lin <shawn.l

ufs: backport ufs from upstream

Add ufs directory and cover some SCSI interface to fit for current
SCSI model.

Change-Id: I24c13fc494b1596905d9397a551b10f965dcb4dd
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>

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