staging: r8188eu: Remove all 5GHz network types

Remove all 5Ghz network types. r8188eu works on
802.11bgn standards and on 2.4Ghz band.

Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Link: https://lore.kernel.org/r/20210812002519.23678-2-fmdefrancesco@gmail.com


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