[connman] Fix offlinemode after reboot.

Fixes wlan and bluetooth being powered on after reboot when in
offlinemode.

This change essentially reverts:

commit c3c35b8842b24546b0424ca1d83ca919ffd2427c
Author: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Date:   Mon Jul 15 17:32:56 2013 +0300

    technology: Checking offline mode separately when rfkill device is
    added

made to connman 1.17