usb: core: Kconfig: Improve USB authorization mode help

Update the default USB device authorization mode help text so that the
meaning of the option and it's available values are described more
accurately.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/linux-usb/CAMuHMdUy793gzDVR0jfNnx5TUdJ_2MKH5NPGSgHkytAhArtqmw@mail.gmail.com/


Signed-off-by: Niko Mauno <niko.mauno@vaisala.com>
Link: https://lore.kernel.org/r/20240213124518.20231-1-niko.mauno@vaisala.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>