arm: dts: define OP-TEE resources for STM32MP15 DHCOM based boards

Enable OP-TEE node defined in stm32mp151.dtsi and define OP-TEE
reserverd memory for all boards based on STM32MP15 DHCOM.

Signed-off-by: Johann Neuhauser <jneuhauser@dh-electronics.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi

@@ -61,6 +61,11 @@
 			reg = <0x38000000 0x10000>;
 			no-map;
 		};
+
+		optee_memory: optee@fe000000 {
+			reg = <0xfe000000 0x2000000>;
+			no-map;
+		};
 	};
 
 	ethernet_vio: vioregulator {
@@ -421,6 +426,10 @@
 	status = "okay";
 };
 
+&optee {
+	status = "okay";
+};
+
 &pwr_regulators {
 	vdd-supply = <&vdd>;
 	vdd_3v3_usbfs-supply = <&vdd_usb>;