ARM: dts: msm: Update APC CPR voltage margins for msm8920

Update APC CPR static open-loop and closed-loop voltage margins
for msm8920 as per new voltage characterization results.

CRs-Fixed: 1115776
Change-Id: Ief25d4eab816faccdd9e2d97ee1a5477867415cf
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>