rtlwifi: btcoex: 21a 2ant: just return when wifi is under ips

If wifi is in power saving mode, do nothing.

Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Pkshih <pkshih@realtek.com>
Cc: Birming Chiu <birming@realtek.com>
Cc: Shaofu <shaofu@realtek.com>
  ---
 drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtc8821a2ant.c | 6 ++++++
 1 file changed, 6 insertions(+)
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>