scsi: ufs: amend interrupt configuration

It makes interrupt setting more flexible especially
for disabling. And wrong bit mask is fixed for ver 1.0.
[17:16] is added for mask.

Change-Id: If5df41ff69fd09a74c9577f7de11ddda79cd71f4
Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Tested-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Santosh Y <santoshsy@gmail.com>
Patch-mainline: linux-scsi@vger.kernel.org @ 05/19/2013, 13:51
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>