[Precise][SRU] drm/i915: Remove too early plane enable on pre-PCH hardware

[Chris J Arges]

SRU Justification:

Impact:
Users with an Intel GMA X3000 graphics card experience display
corruption when using Precise. This occurs when there is a resolution
change.

Fix:
Commit c7bd4c25650704d4d065eb4ce2a122d2a80ce804 fixes this issue, and is
currently in Quantal. Cherry-picking this patch causes the display to
work properly even after extensive resolution changes.

Testcase:
Change resolution repeatedly using xrandr on a computer with the Intel
GMA X3000 graphics card. Check for display corruption.

BugLink: http://bugs.launchpad.net/bugs/949130

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