ARM: dts: qcom: msm8960: declare SAW2 regulators

The SAW2 (SPM and AVS Wrapper) among other things is yet another way to
handle CPU-related PMIC regulators. Provide a way to control voltage of
these regulators.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240102-saw2-spm-regulator-v7-18-0472ec237f49@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>