staging: rtl8723bs: remove 5Ghz code blocks

remove 5 Ghz code blocks, related to networks
working over channel numbers above 14.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/c64443b92ce1a60f568db153842a62e3244a8c3a.1626874164.git.fabioaiuto83@gmail.com


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