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

Fix a misspelling of the word "functional".
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/3da9bd360e1c83007af0e0e90fa4e6c2b50fdab3.1652100633.git.geert+renesas@glider.beSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -34,7 +34,7 @@ properties:
     # 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