ARM: dts: stm32: optee async notif interrupt for MP15 scmi variants

Define the interrupt used by OP-TEE async notif on stm32mp15 scmi based
platforms.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Link: https://lore.kernel.org/r/20250603-stm32mp157f-dk2-v2-5-5be0854a9299@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: etienne-lms

arch/arm/boot/dts/st/stm32mp15-scmi.dtsi

@@ -11,6 +11,8 @@
 		optee: optee {
 			compatible = "linaro,optee-tz";
 			method = "smc";
+			interrupt-parent = <&intc>;
+			interrupts = <GIC_PPI 15 (GIC_CPU_MASK_SIMPLE(1) | IRQ_TYPE_LEVEL_LOW)>;
 		};
 
 		scmi: scmi {