ARM: dts: stm32: Fix GPIO hog flags on DHCOM PicoITX

The GPIO hog flags are ignored by gpiolib-of.c now, set the flags to 0.
Due to a change in gpiolib-of.c, setting flags to GPIO_ACTIVE_LOW and
using output-low DT property leads to the GPIO being set high instead.

Fixes: ac68793f49de ("ARM: dts: stm32: Add DHCOM based PicoITX board")
Signed-off-by: Marek Vasut <[e-mail]>
Cc: Alexandre Torgue <[e-mail]>
Cc: Maxime Coquelin <[e-mail]>
Cc: Patrice Chotard <[e-mail]>
Cc: Patrick Delaunay <[e-mail]>
Cc: [e-mail]
To: [e-mail]
Signed-off-by: Alexandre Torgue <[e-mail]>

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

···
 	 */
 	usb-port-power-hog {
 		gpio-hog;
-		gpios = <13 GPIO_ACTIVE_LOW>;
+		gpios = <13 0>;
 		output-low;
 		line-name = "usb-port-power";
 	};