bluetooth: Separate notification tests
We separate the tests so that we don't have to manually stop notifications
after each test is done. Because notifications state is kept in the frame
and the frame cleans up the state after navigation we know the tests
won't interfere with each other.
BUG=
554240
Committed:
https://crrev.com/af5b0e45b29290c7d013e3c5e01a86fcfa9d50a4
Cr-Commit-Position: refs/heads/master@{#387734}