ARM: dts: msm: use VDD_APCC CPR hardware closed-loop mode for msm8996v2.1

VDD_APCC CPR hardware closed-loop mode may be used on MSM8996v2.1
but not on MSM8996v2.0.  Enable the usage of hardware closed-loop
mode on MSM8996v2.1 but ensure that it remains disallowed for
MSM8996v2.0.  msm8996-v2.dtsi is shared between v2.0 and v2.1
boards whereas msm8996-v2.0-*.dts files are v2.0 specific.

Change-Id: I5bfe66924a9ff3246cec69e9a49e8612d592c5fa
Signed-off-by: David Collins <collinsd@codeaurora.org>