arm64: dts: qcom: sm8450: Add IMEM and PIL info region

Add a simple-mfd representing IMEM on SM8450 and define the PIL
relocation info region, so that post mortem tools will be able
to locate the loaded remoteprocs.
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1677079845-17650-1-git-send-email-quic_mojha@quicinc.com

arch/arm64/boot/dts/qcom/sm8450.dtsi

@@ -3689,6 +3689,20 @@ data-pins {
 			};
 		};
 
+		sram@146aa000 {
+			compatible = "qcom,sm8450-imem", "syscon", "simple-mfd";
+			reg = <0 0x146aa000 0 0x1000>;
+			ranges = <0 0 0x146aa000 0x1000>;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			pil-reloc@94c {
+				compatible = "qcom,pil-reloc-info";
+				reg = <0x94c 0xc8>;
+			};
+		};
+
 		apps_smmu: iommu@15000000 {
 			compatible = "qcom,sm8450-smmu-500", "arm,mmu-500";
 			reg = <0 0x15000000 0 0x100000>;