staging: rtl8723bs: remove unused mac_reg_dump() function argument

remove unused function argument void *sel from mac_reg_dump.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/2ae03ee765c861d1fd4237af7b8d11a918be0d76.1619254603.git.fabioaiuto83@gmail.com


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