arm64: dts: qcom: qcs404: 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/20220607171848.535128-9-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/qcs404.dtsi

@@ -1120,7 +1120,7 @@ blsp2_spi0: spi@7af5000 {
 		};
 
 		sram@8600000 {
-			compatible = "simple-mfd";
+			compatible = "qcom,qcs404-imem", "syscon", "simple-mfd";
 			reg = <0x08600000 0x1000>;
 
 			#address-cells = <1>;