rtlwifi: fix tm_trigger usage

While working on getting my rtl8821au driver in pretty shape for
inclusion, it is dicosvered that the tm_trigger flag is used only for
the first device using this driver.
This flag handles the thermal power management in the hardware.

To change this add a entry in sttruct rtl_dm, so each device can handle
is separately.

Signed-off-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
diff --git a/drivers/net/wireless/rtlwifi/wifi.h b/drivers/net/wireless/rtlwifi/wifi.h
index 5157291..2b770b5 100644
--- a/drivers/net/wireless/rtlwifi/wifi.h
+++ b/drivers/net/wireless/rtlwifi/wifi.h
@@ -1665,6 +1665,7 @@
 	u8 last_dtp_lvl;
 	u8 thermalvalue_avg[AVG_THERMAL_NUM];
 	u8 thermalvalue_avg_index;
+	u8 tm_trigger;
 	bool done_txpower;
 	u8 dynamic_txhighpower_lvl;	/*Tx high power level */
 	u8 dm_flag;		/*Indicate each dynamic mechanism's status. */