dt-bindings: pinctrl: pinctrl-single: add marvell,pxa1908-padconf compatible

Add the "marvell,pxa1908-padconf" compatible to allow migrating to a
separate pinctrl driver later.

Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
Link: https://lore.kernel.org/20241104-pxa1908-lkml-v13-2-e050609b8d6c@skole.hr
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: LegoLivesMatter

Documentation/devicetree/bindings/pinctrl/pinctrl-single.yaml

@@ -33,6 +33,10 @@ properties:
               - ti,omap5-padconf
               - ti,j7200-padconf
           - const: pinctrl-single
+      - items:
+          - enum:
+              - marvell,pxa1908-padconf
+          - const: pinconf-single
 
   reg:
     maxItems: 1