[Intel-gfx] Align the height of untiled pixmaps to 2 lines as well

[Carl Worth]

Excerpts from anholt's message of Wed Aug 19 09:21:11 -0700 2009:
>     Align the height of untiled pixmaps to 2 lines as well.
>     
>     The 965 docs note, and it's probably the case on 915 as well, that the
>     2x2 subspans are read as a unit, even if the bottom row isn't used.  If
>     the address in that bottom row extended beyond the end of the GTT, a
>     fault could occur.
>     
>     Thanks to Chris Wilson for pointing out the problem.

This sounds like sometehing that could fix some "random crashes" bugs, right?

Shall we cherry-pick this to the 2.8 branch for the 2.8.1 release?

-Carl
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