Revert "device: Make sure the device is up and running before enabling it"

This reverts commit a7a5b1698098f0cac5e244979c045b13eca67ad9.
Merge pull request #117 from hmallat/upstream-device-up-patch-revert

Revert "device: Make sure the device is up and running before enabling i...
[connman] Rever code which breaks telephony