arm64: dts: rockchip: rk3308: Add cpuinfo device node

Change-Id: If91b4a3945a368ad50914cb0fd0cfce41600d514
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

Author: finley1226

arch/arm64/boot/dts/rockchip/rk3308.dtsi

@@ -138,6 +138,12 @@
 		interrupt-affinity = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>;
 	};
 
+	cpuinfo {
+		compatible = "rockchip,cpuinfo";
+		nvmem-cells = <&otp_id>;
+		nvmem-cell-names = "id";
+	};
+
 	display_subsystem: display-subsystem {
 		compatible = "rockchip,display-subsystem";
 		ports = <&vop_out>;