ARM: dts: msm: add device info for reducing power stage

B-family PMIC can optionally support reducing power stage
for improving IADC accurancy. This work around occupies while
charging under high load during low battery voltages. In case
board has a bad layout, customer can enable it manually.

Change-Id: I6c11cddfb92c657f8cbbbf9d77d30af44ba80b70
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>