drm/i915: Fix updating FBC
We need to track different state on each generation in order to detect
when we need to refresh the FBC registers.
Signed-off-by: 
Chris Wilson <chris@chris-wilson.co.uk>
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We need to track different state on each generation in order to detect
when we need to refresh the FBC registers.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>