staging: rtl8723bs: fix camel case in argument of macro is_legacy_only

fix camel case in argument of macro is_legacy_only

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/404028e00ca4a32bfaed753d5927d9b673e6058d.1626533647.git.fabioaiuto83@gmail.com


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