ARM: dts: stm32: fix STUSB1600 Type-C irq level on stm32mp15xx-dkx

STUSB1600 IRQ (Alert pin) is active low (open drain). Interrupts may get
lost currently, so fix the IRQ type.

Fixes: 8368616 ("ARM: dts: stm32: add STUSB1600 Type-C using I2C4 on stm32mp15xx-dkx")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/stm32mp15xx-dkx.dtsi

@@ -249,7 +249,7 @@
 	stusb1600@28 {
 		compatible = "st,stusb1600";
 		reg = <0x28>;
-		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
+		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
 		interrupt-parent = <&gpioi>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&stusb1600_pins_a>;