scsi: ufs: add dme configuration primitives

Implements to support GET and SET operations of the DME.
These operations are used to configure the behavior of
the UNIPRO. Along with basic operation, {Peer/AttrSetType}
can be mixed.

Change-Id: Ibd58a342f4dd56961de645ed507e4c33b3064fcb
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>