staging: rtl8723bs: remove 5Ghz code related to channel plan definition

remove 5Ghz code related to channel plan definition.

Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/17a707952cec951893748d2cb59d02a294cdd1be.1624367071.git.fabioaiuto83@gmail.com


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