ARM: dts: stm32: Fix GPIO hog names on DHCOM

The GPIO hog node name should match regex '^(hog-[0-9]+|.+-hog(-[0-9]+)?)$',
make it so and fix the following two make dtbs_check warnings:

arch/arm/boot/dts/stm32mp157c-dhcom-picoitx.dt.yaml: hog-usb-port-power: $nodename:0: 'hog-usb-port-power' does not match '^(hog-[0-9]+|.+-hog(-[0-9]+)?)$'
arch/arm/boot/dts/stm32mp153c-dhcom-drc02.dt.yaml: hog-usb-hub: $nodename:0: 'hog-usb-hub' does not match '^(hog-[0-9]+|.+-hog(-[0-9]+)?)$'

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-drc02.dtsi

···
 	 * during TX anyway and that it only controls drive enable DE
 	 * line. Hence, the RX is always enabled here.
 	 */
-	rs485-rx-en {
+	rs485-rx-en-hog {
 		gpio-hog;
 		gpios = <8 GPIO_ACTIVE_HIGH>;
 		output-low;
···
 	 * order to reset the Hub when USB bus is powered down, but
 	 * so far there is no such functionality.
 	 */
-	usb-hub {
+	usb-hub-hog {
 		gpio-hog;
 		gpios = <2 GPIO_ACTIVE_HIGH>;
 		output-high;

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

···
 	 * in order to turn on port power when USB bus is powered up, but so
 	 * far there is no such functionality.
 	 */
-	usb-port-power {
+	usb-port-power-hog {
 		gpio-hog;
 		gpios = <13 GPIO_ACTIVE_LOW>;
 		output-low;