scsi: ufs: Allow vendor specific initialization

Some vendor specific controller versions might need to configure
vendor specific - registers, clocks, voltage regulators etc. to
initialize the host controller UTP layer and Uni-Pro stack.
Provide some common initialization operations that can be used
to configure vendor specifics. The methods can be extended in
future, for example, for power mode transitions.

The operations are vendor/board specific and hence determined with
the help of compatible property in device tree.

Change-Id: I20b7f5b2b0a2683f250580c6c0220c8f9d08d211
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>