arm64: dts: qcom: msm8992-libra: Add CPU regulators

Specify CPU regulator voltages for both VDD_APC rails.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220319174645.340379-3-konrad.dybcio@somainline.org