staging: rtl8723bs: remove BTC_PRINT_F macro definition

remove unused BTC_PRINT_F macro definition.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/503423caee1cc2b7a8fe321e0efb546556f2887f.1619794331.git.fabioaiuto83@gmail.com


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