scsi: ufs-msm: re-factoring the ufs phy to support various phys

This re-factor is required in order to provide a robust way to support
multiple ufs phys. It also creates a better separation between
ufs-msm block, ufs-msm-phy block and the specific phy blocks.
In this change a generic phy handle is created, using the phy driver
framework.
Two ufs phys are currently supported: 28nm and 20nm
This change also includes the required DT changes as in this case,
the driver changes and the DT changes must be placed within the same
change.

Change-Id: I3aa7ed942ed7b54f3a29c9b9dbdeff1861079066
Signed-off-by: Noa Rubens <noag@codeaurora.org>
Signed-off-by: Gilad Broner <gbroner@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>