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Fully implements the FindMyDeviceControllerImpl class. This change
also features a new state: kRingingNotAvailable.
This state is only set if the DoNotDisturb is enabled.

Bug: 1106937
Test: chromeos_components_unittests
Change-Id: Ifeb4dd88ea19ad6949bad2a92d840f392d7ccd47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438773
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812962}