arm64: zynqmp: Move usb hub from i2c to usb node

Based on upstream discussion based on link below usb hub should be placed
to usb node directly as child node. Based on this Linux driver was updated
and the same change should be also reflected in kv260 board.

Link: https://lore.kernel.org/all/CAL_JsqJZBbu+UXqUNdZwg-uv0PAsNg55026PTwhKr5wQtxCjVQ@mail.gmail.com/


Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/aa18df1978f161b933e6cdc6cd99c807b5f74398.1645629459.git.michal.simek@xilinx.com