staging: rtl8188eu: Replace function name with __func__

Fix the following checkpatch warning:
	WARNING: Prefer using '"%s...", __func__' to using 'rtw_get_bcn_info', this function's name, in a string
Signed-off-by: NBrooke Basile <brookebasile@gmail.com>
Link: https://lore.kernel.org/r/20200629173711.5158-1-brookebasile@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_ieee80211.c

@@ -987,10 +987,10 @@ void rtw_get_bcn_info(struct wlan_network *pnetwork)
 		if (bencrypt)
 			pnetwork->BcnInfo.encryp_protocol = ENCRYP_PROTOCOL_WEP;
 	}
-	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: pnetwork->encryp_protocol is %x\n",
-						       pnetwork->BcnInfo.encryp_protocol));
-	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("rtw_get_bcn_info: pnetwork->encryp_protocol is %x\n",
-						       pnetwork->BcnInfo.encryp_protocol));
+	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: pnetwork->encryp_protocol is %x\n",
+							__func__, pnetwork->BcnInfo.encryp_protocol));
+	RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s: pnetwork->encryp_protocol is %x\n",
+							__func__, pnetwork->BcnInfo.encryp_protocol));
 	rtw_get_cipher_info(pnetwork);
 
 	/* get bwmode and ch_offset */