dt-bindings: mfd: brcm,cru: Rename pinctrl node

This matches pinctrl.yaml requirement and fixes:

Documentation/devicetree/bindings/mfd/brcm,cru.example.dt.yaml: pin-controller@1c0: $nodename:0: 'pin-controller@1c0' does not match '^(pinctrl|pinmux)(@[0-9a-f]+)?$'
From schema: Documentation/devicetree/bindings/pinctrl/brcm,ns-pinmux.yaml

Signed-off-by: Rafał Miłecki <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/mfd/brcm,cru.yaml

···
   '^phy@[a-f0-9]+$':
     $ref: ../phy/bcm-ns-usb2-phy.yaml
 
-  '^pin-controller@[a-f0-9]+$':
+  '^pinctrl@[a-f0-9]+$':
     $ref: ../pinctrl/brcm,ns-pinmux.yaml
 
   '^syscon@[a-f0-9]+$':
···
             reg = <0x180 0x4>;
         };
 
-        pin-controller@1c0 {
+        pinctrl@1c0 {
             compatible = "brcm,bcm4708-pinmux";
             reg = <0x1c0 0x24>;
             reg-names = "cru_gpio_control";