Rework network config

- remove obsolete crontabs
- move mac handling to network.sh
- update wr741xx, wr740 and wr1043 to new network config

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>
bsp/wr*: set fixed ifname for wifi interfaces

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>
buildscript: update sources

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>
bsp/wdr4300: update network config

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>
bsp/wdr4900: update network config

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>
bsp/*/.config: update openwrt

- disable fastd encryption

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>