connman: disable on avr32

The inotify_init1 syscall is not available on avr32. Fixes build failures
such as the following.

  http://autobuild.buildroot.net/results/0d8/0d8e7bd8bd3f227fabfb0d5feb59a5d316026d3f



Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>