scsi: ufs: Unit test fixes

Match new unit descriptor size definition.
Update logging with:
- prefix with module name
- add '\n' in the end
- test_pr_* removed

Change-Id: Ic086f9b62c5431ba85a667b771e930ea96d253e0
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>