drm/i915: rip out the HWSTAM missed irq workaround
With the new ducttape of much finer quality, this seems to be no longer necessary. Tested on my ivb and snb machine with the usual suspects of testcases. (v2 by keithp -- limited change to IVB only for now) Signed-Off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Acked-by: NBen Widawsky <ben@bwidawsk.net> Signed-off-by: NKeith Packard <keithp@keithp.com>
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