i915 SSC Patch

[Ben Brewer]

I've added a global SSC (Spread Spectrum Clock) parameter to the i915 
driver, since having SSC enabled breaks (distorts) VGA output on some 
Core i5/i7 chips (see https://bugs.freedesktop.org/show_bug.cgi?id=38750).
SSC is still enabled by default so the behaviour won't change but 
setting the global_use_ssc parameter will turn this feature off and 
allow affected devices to function correctly (notably the Dell Vostro 3300).

Numerous people have tested this and reported it working (as seen in the 
bug report thread) which isn't surprising considering it's a basic 
modification of Chris Wilsons work.

Any comments, or anybody willing to include this patch?

Thanks,
Ben Brewer (CodeThink)
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