staging: rtl8723bs: replace EID_BSSCoexistence

Replace unique EID_BSSCoexistence constant with kernel provided
WLAN_EID_BSS_COEX_2040 from linux/ieee80211.h.
Signed-off-by: Ross Schmidt <ross.schm.dev@gmail.com>
Link: https://lore.kernel.org/r/20201208040733.379197-18-ross.schm.dev@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_mlme_ext.c

@@ -4096,7 +4096,7 @@ static void issue_action_BSSCoexistPacket(struct adapter *padapter)
 
 		iedata |= BIT(2);/* 20 MHz BSS Width Request */
 
-		pframe = rtw_set_ie(pframe, EID_BSSCoexistence,  1, &iedata, &(pattrib->pktlen));
+		pframe = rtw_set_ie(pframe, WLAN_EID_BSS_COEX_2040,  1, &iedata, &(pattrib->pktlen));
 
 	}