ARM: dts: msm: update APC CPR voltage margins for sdm439

Add CPR closed-loop voltage margins as per sdm439 voltage
plan. Also add floor-to-ceiling voltage range values.

Change-Id: Ifa6373e8e97db756e1e4d95a81006b6b63d5eeb0
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>