Send boot complete broadcast when unhibernated

Apps that have been force-stopped may want to register job/alarms when
they are no longer force-stopped, so resend the boot complete broadcast
when an app is unhibernated.

Bug: 185261245
Test: atest AppHibernationServiceTest
Test: manual
Change-Id: Ia60f7b566d2f03746b232e0ea5a8002d33703f09