rtlwifi: btcoex: Add customer_id to do special deal to oem vendor

Add customer_id field in structure, and then this is a clue to implement
the behavior defined by vendor LENOVO_CHINA.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/wifi.h

@@ -556,6 +556,7 @@ enum rt_oem_id {
 	RT_CID_NETGEAR = 36,
 	RT_CID_PLANEX = 37,
 	RT_CID_CC_C = 38,
+	RT_CID_LENOVO_CHINA = 40,
 };
 
 enum hw_descs {