arm64: dts: qcom: drop incorrect cell-index from SPMI

The SPMI controller (PMIC Arbiter)) does not use nor allow 'cell-index'
property:

  sm8150-microsoft-surface-duo.dtb: spmi@c440000: Unevaluated properties are not allowed ('cell-index' was unexpected)
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230308125906.236885-1-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/ipq8074.dtsi

@@ -397,7 +397,6 @@ spmi_bus: spmi@200f000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		sdhc_1: mmc@7824900 {

arch/arm64/boot/dts/qcom/msm8976.dtsi

@@ -809,7 +809,6 @@ spmi_bus: spmi@200f000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		sdhc_1: mmc@7824000 {

arch/arm64/boot/dts/qcom/msm8998.dtsi

@@ -1993,7 +1993,6 @@ spmi_bus: spmi@800f000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		usb3: usb@a8f8800 {

arch/arm64/boot/dts/qcom/sc7180.dtsi

@@ -3288,7 +3288,6 @@ spmi_bus: spmi@c440000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		sram@146aa000 {

arch/arm64/boot/dts/qcom/sdm630.dtsi

@@ -1189,7 +1189,6 @@ spmi_bus: spmi@800f000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		usb3: usb@a8f8800 {

arch/arm64/boot/dts/qcom/sdm845.dtsi

@@ -4935,7 +4935,6 @@ spmi_bus: spmi@c440000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		sram@146bf000 {

arch/arm64/boot/dts/qcom/sm6125.dtsi

@@ -1134,7 +1134,6 @@ spmi_bus: spmi@1c40000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		apps_smmu: iommu@c600000 {

arch/arm64/boot/dts/qcom/sm8150.dtsi

@@ -3968,7 +3968,6 @@ spmi_bus: spmi@c440000 {
 			#size-cells = <0>;
 			interrupt-controller;
 			#interrupt-cells = <4>;
-			cell-index = <0>;
 		};
 
 		apps_smmu: iommu@15000000 {