scsi: Remove compilation error introduced by a previous change

This fixes a compilation error introduced by commit
491666a2 "scsi: ufs: created UFS unit-tests
framework" which added a function that uses struct device without declaring
it.

CRs-fixed: 551713
Change-Id: I9d6f73c8d780fa33672b386c1358c667dffc0a79
Signed-off-by: Tarun Gupta <tarung@codeaurora.org>