wifi: rtw88: 8821cu: Fix connection failure

commit 605d7c0 upstream.

Clear bit 8 of REG_SYS_STATUS1 after MAC power on.

Without this, some RTL8821CU and RTL8811CU cannot connect to any
network:

Feb 19 13:33:11 ideapad2 kernel: wlp3s0f3u2: send auth to
	90:55:de:__:__:__ (try 1/3)
Feb 19 13:33:13 ideapad2 kernel: wlp3s0f3u2: send auth to
	90:55:de:__:__:__ (try 2/3)
Feb 19 13:33:14 ideapad2 kernel: wlp3s0f3u2: send auth to
	90:55:de:__:__:__ (try 3/3)
Feb 19 13:33:15 ideapad2 kernel: wlp3s0f3u2: authentication with
	90:55:de:__:__:__ timed out

The RTL8822CU and RTL8822BU out-of-tree drivers do this as well, so do
it for all three types of chips.

Tested with RTL8811CU (Tenda U9 V2.0).

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/aeeefad9-27c8-4506-a510-ef9a9a8731a4@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/wireless/realtek/rtw88/mac.c

@@ -309,6 +309,13 @@ static int rtw_mac_power_switch(struct rtw_dev *rtwdev, bool pwr_on)
 	pwr_seq = pwr_on ? chip->pwr_on_seq : chip->pwr_off_seq;
 	ret = rtw_pwr_seq_parser(rtwdev, pwr_seq);
 
+	if (pwr_on && rtw_hci_type(rtwdev) == RTW_HCI_TYPE_USB) {
+		if (chip->id == RTW_CHIP_TYPE_8822C ||
+		    chip->id == RTW_CHIP_TYPE_8822B ||
+		    chip->id == RTW_CHIP_TYPE_8821C)
+			rtw_write8_clr(rtwdev, REG_SYS_STATUS1 + 1, BIT(0));
+	}
+
 	if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_SDIO)
 		rtw_write32(rtwdev, REG_SDIO_HIMR, imr);