config: drop the dbus API

config: drop the dbus API

This API has been disabled by default since 1.4, the first release it came in.
There a no known users of it and even its direct replacement (HAL) has
been superseeded by udev on supported platforms since 1.8.

This code is untested, probably hasn't been compiled in years and should not
be shipped.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>