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chamelium: add tests for link retraining

We are getting rid of dp-link-status subtest - in its current form the test is making Chamelium's receiver signal a need for retraining to the upstream, which i915 handles correctly. But then it asserts a number of conditions that are neither a part of the DisplayPort spec, conformance test suite nor the current driver's behavior.

We want something that covers link status property, checks for link downgrading and uses the "request retraing" mechanism that chamelium provies.

You can read on what went wrong with the current test and some ideas here: intel#1059 (comment 433495)

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