ARM: dts: msm: add sde rotator reg bus scale properties

Add sde rotator reg bus scale properties for sdm660 and sdm630.
These votes are required for faster reg access especially
in cases like histogram/gamut where we read large number of
registers.

Change-Id: I759a543aa8f2bbd50f4c26f35c29a585f059fd9f
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>