arm64: dts: qcom: sa8775p: Add RPMh sleep stats

Add device node for sleep stats driver which provides various
low power mode stats.
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Raghavendra Kakarla <quic_rkakarla@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230929054805.27847-1-quic_rkakarla@quicinc.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

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

@@ -1925,6 +1925,11 @@ IPCC_MPROC_SIGNAL_GLINK_QMP
 			#clock-cells = <0>;
 		};
 
+		sram@c3f0000 {
+			compatible = "qcom,rpmh-stats";
+			reg = <0x0 0x0c3f0000 0x0 0x400>;
+		};
+
 		spmi_bus: spmi@c440000 {
 			compatible = "qcom,spmi-pmic-arb";
 			reg = <0x0 0x0c440000 0x0 0x1100>,