scsi: ufs: add unipro attribute IDs

'drivers/scsi/ufs/unipro.h' is added.
Attributes in the layers of the UNIPRO stack can be
read and written via the DME.

Change-Id: I51c4d9f7933a06668c408e23430300883368d102
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Patch-mainline: linux-scsi@vger.kernel.org @ 2013/08/26, 14:40
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>