usb: host: rework ch9 tools to work on USB device

Use the USB device structure and wrappers introduced earlier.
With this patch, users of ch9 requests do not need to work
directly with the UHC API. The requests are now blocked until
there is a response from the UHC. Callers finally have access
to the data buffer and request status.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>