dt-bindings: usb: hx3: Remove unneeded dr_mode

It is expected that the USB controller works in host mode
to have the USB hub operational.

Remove such unneeded property from the devicetree example.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Link: https://lore.kernel.org/r/20240405195051.945474-1-festevam@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/cypress,hx3.yaml

@@ -51,7 +51,6 @@ examples:
     #include <dt-bindings/gpio/gpio.h>
 
     usb {
-        dr_mode = "host";
         #address-cells = <1>;
         #size-cells = <0>;