staging: rtl8723bs: remove some unused 5Ghz macro definitions

remove some unused 5Ghz macro definitions. Fix
comments accordingly.

Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/8d2933555170e5f206b9198a203e8a31ee2b7702.1624367071.git.fabioaiuto83@gmail.com


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