ARM: dts: samsung: exynos4x12: replace duplicate pmu node with phandle

Devicetree for the FIMC IS camera included duplicated PMU node as its
child.  This is not a correct representation of the hardware.  Mapping
the PMU (Power Management Unit) IO memory should be via syscon-like
phandle (samsung,pmu-syscon, already used for other drivers), not by
duplicating "pmu" Devicetree node inside the FIMC IS.

The change is not compatible with older Linux kernel, which does not
parse samsung,pmu-syscon property.

Link: https://lore.kernel.org/r/20230722121719.150094-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

arch/arm/boot/dts/samsung/exynos4x12.dtsi

@@ -516,15 +516,12 @@ fimc_is: fimc-is@12000000 {
 		iommus = <&sysmmu_fimc_isp>, <&sysmmu_fimc_drc>,
 			 <&sysmmu_fimc_fd>, <&sysmmu_fimc_mcuctl>;
 		iommu-names = "isp", "drc", "fd", "mcuctl";
+		samsung,pmu-syscon = <&pmu_system_controller>;
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;
 		status = "disabled";
 
-		pmu@10020000 {
-			reg = <0x10020000 0x3000>;
-		};
-
 		i2c1_isp: i2c-isp@12140000 {
 			compatible = "samsung,exynos4212-i2c-isp";
 			reg = <0x12140000 0x100>;