staging: rtl8723bs: remove DBG_COUNTER definition from rtw_debug.h

staging: rtl8723bs: remove DBG_COUNTER definition from rtw_debug.h

Remove DBG_COUNTER macro definition from include/rtw_debug.h, as
all uses of it have now been removed and it is no longer required.
The DBG_COUNTER incremented values were never actually used anywhere
else in the driver.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210215233440.80617-6-phil@philpotter.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>