arm64: zynqmp: Add an OP-TEE node to the device tree

Since the zynqmp boards can run upstream OP-TEE, and having the DT node
present doesn't cause any side effects add it in case someone tries to
load OP-TEE.

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Link: https://lore.kernel.org/r/20230216133921.866786-1-ilias.apalodimas@linaro.org
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/arch/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index 2a6b3b2..6a16638 100644
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -147,6 +147,11 @@
 	};
 
 	firmware {
+		optee: optee  {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+		};
+
 		zynqmp_firmware: zynqmp-firmware {
 			compatible = "xlnx,zynqmp-firmware";
 			#power-domain-cells = <1>;