ARM: dts: msm: operate APC CPR in open-loop mode for msm8920

Disable APC CPR closed-loop operation and use open-loop operation
for msm8920. Closed-loop operation would be enabled after functional
validation on silicon.

CRs-Fixed: 1075013
Change-Id: I47d2e578743e771ad86aea850865dd7769841563
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>