ARM: dts: msm: Add LMH QREF regulator voting for SDM855

LMH requires the QREF regulators for its current sensors. Adding this
configuration will make the LMH driver to place a active only vote on
the QREF regulator in SDM855.

Change-Id: I4bab4873a4054ba5d22376f18fc774daa53b7881
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>