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

arch/arm64/boot/dts/qcom/pm660.dtsi

@@ -47,4 +47,15 @@ pm660_gpios: gpios@c000 {
 			#interrupt-cells = <2>;
 		};
 	};
+
+	pmic@1 {
+		compatible = "qcom,pm660", "qcom,spmi-pmic";
+		reg = <0x1 SPMI_USID>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		pm660_spmi_regulators: pm660-regulators {
+			compatible = "qcom,pm660-regulators";
+		};
+	};
 };