Limit maximum tiled stride to 8k and untiled to 32k.

Tiling on gen 2/3 hardware is only supported for pitches up to 8192
bytes, so above this limit the surface will be untiled and we will no
longer have to comply with the power-of-two pitch alignment. So
disabling tiling for these too wide surface should ~halve the memory
requirement for the full surface.

Also the absolute limit for the 2D blitter is 32,768 bytes. The
documentation says "up to 32,768 bytes" and my PineView box was
malfunction with a surface stride of 32,768 so set the limit to be
32,767.

References:

  Bug 28497 - Graphics corruption after opening a specific website
  https://bugs.freedesktop.org/show_bug.cgi?id=28497

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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