DeskClock : Move default action for flip and shake to overlay

The current default action for flip and shake when alarm comes
is hardcoded. Move it to overlay, so we can config it easily
and overrided by device settings.
Also change the default action for flip to dismiss alarm.

Change-Id: I18a1850b7bf5f9342b121f6a9c930b3a05d40ed1
3 files changed