ARM: dts: qcom: msm8960: move vsdcc regulator out of simple-bus

It is not recommended to place regulator nodes inside simple-bus,
so move it out in order to fix the warnings generated by
dtschema/schemas/simple-bus.yaml schema.

Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220108202558.82044-1-david@ixit.cz