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

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

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

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

@@ -60,6 +60,11 @@
  reg = <0x38000000 0x10000>;
  no-map;
  };
+
+ optee_memory: optee@fe000000 {
+ reg = <0xfe000000 0x2000000>;
+ no-map;
+ };
  };
 };
 
@@ -240,6 +245,10 @@
  status = "okay";
 };
 
+&optee {
+ status = "okay";
+};
+
 &pwr_regulators {
  vdd-supply = <&vdd>;
  vdd_3v3_usbfs-supply = <&vdd_usb>;