Add a system setting to signal that the Clockwork
Home application has finished initializing.
The setting is marked as transient so it's value
is not persistent during device reboot.
Bug: 149253712
Change-Id: I74e75509dd22b3a1a5cc4c88866d059fed44a347
(cherry picked from commit 3084060da2b4c4fc66a47b75ef85adc11c4de36f)