staging: rtl8723bs: remove unnecessary logging in core/rtw_wlan_util.c

fix the following checkpatch.pl issues:

WARNING: Unnecessary ftrace-like logging - prefer using ftrace
1140: FILE: drivers/staging/rtl8723bs/core/rtw_wlan_util.c:1140:
+	DBG_871X("%s\n", __func__);

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/20210318152610.16758-6-fabioaiuto83@gmail.com


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