scsi: ufs: splits vops and creates wrapper functions

This patch splits the vops by type and creates wrapper
functions for all vops.
Used in order clarify the runtime code and to allow
further types of vops.
This is the first step towards rearchitecting the
variant implementation of the UFS driver - per requirement
from the community. As this will become a full-blown
rearchitecture - incrementing the driver version.

Change-Id: Ifd0a5412a608590bc6c761caf0b3a87aed37f70b
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>