ARM: dts: qcom: sdx55: add dedicated IMEM and syscon compatibles

Add proper compatibles to the IMEM device node:
1. syscon to allow accessing memory from other devices,
2. dedicated compatible as required for syscon and simple-mfd nodes.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220607171848.535128-6-krzysztof.kozlowski@linaro.org

arch/arm/boot/dts/qcom-sdx55.dtsi

@@ -562,7 +562,7 @@ tlmm: pinctrl@f100000 {
 		};
 
 		sram@1468f000 {
-			compatible = "simple-mfd";
+			compatible = "qcom,sdx55-imem", "syscon", "simple-mfd";
 			reg = <0x1468f000 0x1000>;
 
 			#address-cells = <1>;