scsi: ufs: remove the duplicate function declarations

Commit 87ab449e105c ("scsi: ufs: splits vops and creates wrapper
functions") introduced duplicate function declarations in header
file, this change remove these duplicates.

Change-Id: I382491e6dadd8b459977d5c3db9ea81a234f6273
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>