scsi: ufs: release spinlock and fix workqueue allocation

This fixes synchronization bug introduced with
commit b557a611
("scsi: ufs: ice: propagate memeory allocation failure error")
Also in low end ufs targets crypto engine is initialized in
every resume operation. This will endup allocating memory
for crypto worker queue in every resume. Check for queue pointer
before allocating the memory for work queue.

Change-Id: I919a6cbfc418de335e797d4fd724cd3c63bace55
Signed-off-by: Neeraj Soni <neersoni@codeaurora.org>