staging: rtl8723bs: Fix coding style issues

checkpatch.pl reported errors for use of extra whitespaces
in the function prototypes.

Removed extra spaces to meet the coding standards.

Signed-off-by: Adheer Chandravanshi <adheerchandravanshi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>