rtlwifi: rtl8723be: Fix loss of signal

In commit c713fb07 ("rtlwifi: rtl8821ae: Fix connection lost problem
correctly") a problem in rtl8821ae that caused loss of signal was fixed.
That same problem has now been reported for rtl8723be. Accordingly,
the ASPM L1 latency has been increased from 0 to 7 to fix the instability.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Tested-by: James Cameron <quozl@laptop.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/rtl8723be/hw.c

@@ -1125,7 +1125,8 @@ static void _rtl8723be_enable_aspm_back_door(struct ieee80211_hw *hw)
 
 	/* Configuration Space offset 0x70f BIT7 is used to control L0S */
 	tmp8 = _rtl8723be_dbi_read(rtlpriv, 0x70f);
-	_rtl8723be_dbi_write(rtlpriv, 0x70f, tmp8 | BIT(7));
+	_rtl8723be_dbi_write(rtlpriv, 0x70f, tmp8 | BIT(7) |
+			     ASPM_L1_LATENCY << 3);
 
 	/* Configuration Space offset 0x719 Bit3 is for L1
 	 * BIT4 is for clock request