scsi: fix the type for well known LUs

Some devices may respond with wrong type for well-known logical units.
This patch forces well-known type for devices which doesn't report it
correct.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>