dt-bindings: pinctrl: st,stm32: Document gpio-hog pattern property

Document gpio-hog pattern property and its subnodes.
This fixes dtbs_check warnings when building current Linux DTs:

"
arch/arm/boot/dts/stm32mp153c-dhcom-drc02.dtb: pinctrl@50002000: gpio@50003000: 'rs485-rx-en-hog' does not match any of the regexes: 'pinctrl-[0-9]+'
"

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220926204735.381779-1-marex@denx.de
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml

@@ -107,6 +107,12 @@ patternProperties:
         minimum: 0
         maximum: 11
 
+    patternProperties:
+      "^(.+-hog(-[0-9]+)?)$":
+        type: object
+        required:
+          - gpio-hog
+
     required:
       - gpio-controller
       - '#gpio-cells'