[Natty][SRU][PATCH] drm/i915: fix CB tuning check for ILK+

[TImo Aaltonen]

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/891031

This patch fixes panel corruption on my T420s which occurs after
plugging an external monitor to the vga port. Originally from 3.1,
applies to 3.0 too but I'll post this upstream to include in the stable
series.

upstream commit cb0e093162d7b6589c2217a00e2abfef686b32d6

Signed-off-by: Timo Aaltonen <timo.aaltonen at canonical.com>
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