drm/i915: avoid reading non-existent PLL reg on Ironlake+
These functions need to be reworked for Ironlake and above, but until then at least avoid reading non-existent registers. Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> [ickle: combine with a gratuitous tidy] Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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