[host] app: fix app state race in lgmpTimer thread #1148
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While resuming from hibernation lgmpTimer may transition app.state to APP_STATE_REINIT_LGMP. Sometimes the transition is lost if the app_main processing loop also changes app.state simultaneously. This seems to occur frequently with the hibernation use case.
Separate lgmp timer state into its own enum. Move resulting app.state transitions to the app_main loop so they are serialized.