ARM: dts: qcom: msm8660-surf: move fixed regulator out of soc

Fixed regulators, like stub for SDCC Power, are not part of SoC, so they
should be outside of the soc node.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220810080516.166866-4-krzysztof.kozlowski@linaro.org