dt-bindings: pinctrl: pinctrl-single: add ti,am62l-padconf compatible

Add the "ti,am62l-padconf" compatible to allow for some changes in the
driver in the future when needed.

Signed-off-by: Bryan Brattlof <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

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

···
       - items:
           - enum:
               - ti,am437-padconf
+              - ti,am62l-padconf
               - ti,am654-padconf
               - ti,dra7-padconf
               - ti,omap2420-padconf