pingreboot64 rework

[crhbetz]

My second swing at bringing pingreboot to 64bit land 😉

Also adding a forgotten echo and three little logcat messages to 42mad to see it's alive and launching pingreboot.

The ifconfig way of re-enabling works on my 10+ 64bit x96mini. I tried to make it wifi-compatible by identifying the $INTERFACE from the script instead of hard-coding it. I couldn't verify it working on wifi though, lacking devices running on wifi.

I have seen the re-enabling solving connection issues looking at some logcat. After a manually triggered DSL reconnect on my FritzBox, most of the boxes connected to MAD within about 3 seconds of the re-enabling. A couple fell through and rebooted and connected again afterwards.

@krzee - edits by maintainers are enabled, so feel free to remove the lolcat if you don't like it, or change whatever else doesn't fit your taste.