arm64: dts: qcom: sa8775p: Add IMEM and PIL info region

Add a simple-mfd representing IMEM on SA8775p and define the PIL
relocation info region, so that post mortem tools will be able
to locate the loaded remoteprocs.
Signed-off-by: Tengfei Fan <quic_tengfan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Link: https://lore.kernel.org/r/20240531093531.238075-3-quic_tengfan@quicinc.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sa8775p.dtsi

@@ -3044,6 +3044,20 @@ tlmm: pinctrl@f000000 {
 			wakeup-parent = <&pdc>;
 		};
 
+		sram: sram@146d8000 {
+			compatible = "qcom,sa8775p-imem", "syscon", "simple-mfd";
+			reg = <0x0 0x146d8000 0x0 0x1000>;
+			ranges = <0x0 0x0 0x146d8000 0x1000>;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			pil-reloc@94c {
+				compatible = "qcom,pil-reloc-info";
+				reg = <0x94c 0xc8>;
+			};
+		};
+
 		apps_smmu: iommu@15000000 {
 			compatible = "qcom,sa8775p-smmu-500", "qcom,smmu-500", "arm,mmu-500";
 			reg = <0x0 0x15000000 0x0 0x100000>;