staging: rtl8723bs: remove unused _module_mp_ def

remove unused _module_mp_ def.

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/9e8945a3f4f58b32eb2ed3e943f8cc0cd6c26823.1619254603.git.fabioaiuto83@gmail.com


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