Disable Wi-Fi powersave by default for all connections (#4529)

Set wifi.powersave to 2 (disabled) in NetworkManager settings by default for
all connections. Since HAOS is generally used on servers, powersaving doesn't
bring any obvious benefit and is often cause of problems and higher network
latency. If needed, nmcli can be used to override the new default.

Refs #3832

Author: sairon

buildroot-external/rootfs-overlay/etc/NetworkManager/NetworkManager.conf

@@ -13,6 +13,7 @@ backend=journal
 [connection]
 connection.mdns=2
 connection.llmnr=2
+wifi.powersave=2
 
 [connectivity]
 uri=http://checkonline.home-assistant.io/online.txt