dt-bindings: net: ti: k3-am654-cpsw-nuss: Drop pinmux header

Drop the pinmux header reference as it is not used. Examples should
just show the node definition.
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230315155228.1566883-2-nm@ti.comSigned-off-by: Nishanth Menon <nm@ti.com>

Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml

@@ -222,7 +222,6 @@ additionalProperties: false
 
 examples:
   - |
-    #include <dt-bindings/pinctrl/k3.h>
     #include <dt-bindings/soc/ti,sci_pm_domain.h>
     #include <dt-bindings/net/ti-dp83867.h>
     #include <dt-bindings/interrupt-controller/irq.h>