ARM: dts: msm: enable phase scaling for 8974pro devices

Add a property to enable the driver to read the eFuse phase scaling factor
and apply it in the phase calculations. This improves the efficiency of
the PMIC's ganged regulator.

Change-Id: Ifc3663951c23d6217ed632cf43edcf0c4e125de8
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>