ARM: dts: msm: Add APPS regulator phandle for lmh for MSM8996 v3

Add DPM regulator phandle for lmh node for MSM8996 V3
to allow voltage change callbacks to be registered.
The APPS voltage change will be notified to the
DPM.

Change-Id: Ibc319b25472a826eb9d6001cc669237d176fede7
Signed-off-by: Jeff Bernard <jbernard@codeaurora.org>
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>