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.
e2ac2d746f