Drop down late RARE prediction into RESTRICTED.

When an app hasn't been used in a long time (long enough for it to have
naturally time out into the RESTRICTED bucket) and a prediction service
anticipates that an app will not be used anytime soon (by predicting the
app into the RARE bucket), then we drop the app into the RESTRICTED
bucket in such a way that the prediction service can bring it back out
at the appropriate time.

Bug: 153567783
Test: atest FrameworksServicesTests:AppIdleHistoryTests
Test: atest FrameworksServicesTests:AppStandbyControllerTests
Change-Id: I0ec846a6d1bc8e254cabe6a9b504f4cae071def8