drm/i915: Use normal fb deref for the fbcon framebuffer

Now that it's a normally kmalloce buffer we can use the usual cleanup
paths. The upside here is that if we get the refcounting wrong will be
able to catch it, since the drm core will complain about leftover
framebuffers and kref about underflows.

v2: Kill intel_framebuffer_fini - no longer needed now that we
refcount all fbs properly and only confusing.

v3: We actually still need to call unregister_private to remove the fb
from the idr and drop the idr reference - the final unref doesn't do
that. So much for remembering my own fb liftime rules. Reported by
Imre Deak.

Cc: Jesse Barnes <[email protected]>
Reviewed-by: Jesse Barnes <[email protected]> (v2)
Signed-off-by: Daniel Vetter <[email protected]>

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