dt-bindings: usb: ehci: Add Allwinner A83t compatible

The A83t EHCI compatible was introduced in device trees, but it was
never documented.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210721140424.725744-37-maxime@cerno.techSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/generic-ehci.yaml

@@ -34,6 +34,7 @@ properties:
               - allwinner,sun6i-a31-ehci
               - allwinner,sun7i-a20-ehci
               - allwinner,sun8i-a23-ehci
+              - allwinner,sun8i-a83t-ehci
               - allwinner,sun8i-h3-ehci
               - allwinner,sun8i-r40-ehci
               - allwinner,sun9i-a80-ehci