phy: ufs: add UFS PHY support for msmfalcon

Add support for new UFS PHY that is used in
falcon msm.

This PHY is identical to the final 8996 PHY except it
has been moved to VDDMX and level shifters have been added
between the controller/chip and the PHY.

Change-Id: I50681c877917a58c3d70262597300b0d66b1e3a8
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts and
fixed kernel compilation errors]
Signed-off-by: Can Guo <cang@codeaurora.org>