dt-bindings: phy: renesas: usb3-phy: Spelling s/funcional/functional/

Fix a misspelling of the word "functional".

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Reviewed-by: Yoshihiro Shimoda <[e-mail]>
Link: https://lore.kernel.org/r/3da9b[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/phy/renesas,usb3-phy.yaml

···
     # must not be 0.
     minItems: 2
     items:
-      - const: usb3-if # The funcional clock
+      - const: usb3-if # The functional clock
       - const: usb3s_clk # The usb3's external clock
       - const: usb_extal # The usb2's external clock