staging: rtl8723bs: Remove unused function pointer typedef wi_act_func

Remove the 'wi_act_func' typedef as it is not used.
Signed-off-by: Chen Lin <chen.lin5@zte.com.cn>
Link: https://lore.kernel.org/r/1613394174-3826-1-git-send-email-chen45464546@163.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/include/rtw_mp.h

@@ -31,8 +31,6 @@ struct mp_wiparam {
 	u32 io_value;
 };
 
-typedef void(*wi_act_func)(void *padapter);
-
 struct mp_tx {
 	u8 stop;
 	u32 count, sended;