arm64: dts: qcom: pm660: Support SPMI regulators on PMIC sid 1

The PM660 PMIC has SPMI regulators on the PMIC SID 1: let's
declare the second pmic subtree and add the spmi vregs compatible
to probe them there.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210728222542.54269-21-konrad.dybcio@somainline.org


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