UrfArbitrator: Delay creation of WiFi hybris dev

To fix a race condition for MTK SoCs a delay of two seconds is added
before the creation of the hybris device for controlling WiFi.
Merge pull request #13 from alfonsosanchezbeato/fix-load-wifi

Delay creation of WiFi hybris device
UrfArbitrator: save state on rfkill device updates

When urfkill reads a native rfkill event that indicates
that a device's killswitches have been updated, ensure
that the killswitch's persistent state is updated.
Merge pull request #14 from tonyespy/fix-bt-lp1376063

UrfArbitrator: save state on rfkill device updates
Merge branch 'master' into conditional-hybris

Signed-off-by: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@canonical.com>

Conflicts:
	src/urf-arbitrator.c