staging: r8822be: Fix RTL8822be can't find any wireless AP

RTL8822be can't bring up properly on ASUS X530UN, and dmesg says:
[ 8.591333] r8822be: module is from the staging directory, the quality
is unknown, you have been warned.
[ 8.593122] r8822be 0000:02:00.0: enabling device (0000 -> 0003)
[ 8.669163] r8822be: Using firmware rtlwifi/rtl8822befw.bin
[ 9.289939] r8822be: rtlwifi: wireless switch is on
[ 10.056426] r8822be 0000:02:00.0 wlp2s0: renamed from wlan0
...
[ 11.952534] r8822be: halmac_init_hal failed
[ 11.955933] r8822be: halmac_init_hal failed
[ 11.956227] r8822be: halmac_init_hal failed
[ 22.007942] r8822be: halmac_init_hal failed

Jian-Hong reported it works if turn off ASPM with module parameter aspm=0.
In order to fix this problem kindly, this commit don't turn off aspm but
enlarge ASPM L1 latency to 7.
Reported-by: Jian-Hong Pan <jian-hong@endlessm.com>
Tested-by: Jian-Hong Pan <jian-hong@endlessm.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/rtl8822be/hw.c

@@ -803,7 +803,7 @@ static void _rtl8822be_enable_aspm_back_door(struct ieee80211_hw *hw)
 		return;
 
 	pci_read_config_byte(rtlpci->pdev, 0x70f, &tmp);
-	pci_write_config_byte(rtlpci->pdev, 0x70f, tmp | BIT(7));
+	pci_write_config_byte(rtlpci->pdev, 0x70f, tmp | ASPM_L1_LATENCY << 3);
 
 	pci_read_config_byte(rtlpci->pdev, 0x719, &tmp);
 	pci_write_config_byte(rtlpci->pdev, 0x719, tmp | BIT(3) | BIT(4));

drivers/staging/rtlwifi/wifi.h

@@ -88,6 +88,7 @@
 #define RTL_USB_MAX_RX_COUNT			100
 #define QBSS_LOAD_SIZE				5
 #define MAX_WMMELE_LENGTH			64
+#define ASPM_L1_LATENCY				7
 
 #define TOTAL_CAM_ENTRY				32