drm/i915: Track objects in global active list (as well as per-ring)

To handle retirements, we need per-ring tracking of active objects.
To handle evictions, we need global tracking of active objects.

As we enable more rings, rebuilding the global list from the individual
per-ring lists quickly grows tiresome and overly complicated. Tracking the
active objects in two lists is the lesser of two evils.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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