staging: r8188eu: remove 5 GHz channels from ch_freq_map

According to the Realtek documentation the chips this driver supports
are 2.4 GHz only chips. Frequencies for 5 GHz channels can be removed
from the ch_freq_map array.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220222082847.6687-2-straube.linux@gmail.com


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