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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

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

···
     #include <dt-bindings/gpio/gpio.h>
 
     usb {
-        dr_mode = "host";
         #address-cells = <1>;
         #size-cells = <0>;