ARM: dts: msm: add flag for VDD_APCC CBF CPR regulator for msm8996pro

Add the qcom,is-cbf-regulator flag to the VDD_APCC CBF CPR
regulator in order to differentiate it from the power cluster and
performance cluster CPR regulators.  This allows CBF specific
fused voltage offset to be applied.

Change-Id: I0a8710fafaac9e8bf7f3c5cc988d55a44bc99b96
CRs-Fixed: 980901
Signed-off-by: David Collins <collinsd@codeaurora.org>