arm64: dts: rockchip: rk3328: add firmware and optee node

Add optee node to supply OP-TEE required properties.
/optee node is supposed to be below /firmware node.

Change-Id: I5a55a8e62c741726b9c5c7cf33ca832d3cbae86b
Signed-off-by: Zhang Zhijie <zhangzj@rock-chips.com>

Author: ElonZhang0328

arch/arm64/boot/dts/rockchip/rk3328.dtsi

@@ -157,6 +157,13 @@
 		nvmem-cell-names = "id", "cpu-version";
 	};
 
+	firmware {
+		optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+		};
+	};
+
 	psci {
 		compatible = "arm,psci-1.0";
 		method = "smc";