rtlwifi: Add module parameter ASPM

On some platforms, enable ASPM will cause AER error to be logged, thus
we use a parameter to selectively turn on ASPM.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Yan-Hsuan Chuang <yhchuang@realtek.com>
Cc: Birming Chiu <birming@realtek.com>
Cc: Shaofu <shaofu@realtek.com>
Cc: Steven Ting <steventing@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -2262,6 +2262,9 @@ struct rtl_mod_params {
 	/* default: 0 = dma 32 */
 	bool dma64;
 
+	/* default: 1 = enable aspm */
+	int aspm_support;
+
 	/* default 0: 1 means disable */
 	bool disable_watchdog;