usb_usb: Remove hook_usb_startup_wait_loop

usb_usb: Remove hook_usb_startup_wait_loop

matrix_scan in hook_usb_startup_wait_loop is not required for
FC660C since commit dd7b75: SOF timing fix of USB_Host_Shield_2.0.
Without INTERRUPT_CONTROL_ENDPOINT the matrix_scan blocks around 2300ms
and prevents getting USB configured. In the result console_putc
starts sending before hid_listen is ready and chars are lost.

console_is_ready delay value should be around 5000ms if matrix_scan
is needed in hook_usb_startup_wait_loop.