arm64: dts: ls1028a: add optee node

Add the optee node which can either be enabled by a specific board or by
the bootloader.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi

@@ -90,6 +90,14 @@ dpclk: clock-controller@f1f0000 {
 		clocks = <&osc_27m>;
 	};
 
+	firmware {
+		optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+			status = "disabled";
+		};
+	};
+
 	reboot {
 		compatible ="syscon-reboot";
 		regmap = <&rst>;