i965: Don't store qpitch / 4 as mt->qpitch for compressed surfaces.

Broadwell requires software to specify QPitch in a bunch of packets,
so we decided to store it in the miptree.  However, when I did that
refactoring, I missed a subtlety: the hardware expects QPitch to be
"in units of rows in the uncompressed surface".

This is the value we originally compute.  However, for compressed
surfaces, we then divided it by 4 (the block height), to obtain the
physical layout.  This is no longer the QPitch Broadwell expects.

So, store the original undivided value in mt->qpitch, but continue to
use the divided value in brw_miptree_layout_texture_array().  For
non-Broadwell platforms, this should have no impact at all.

Helps fix Piglit's "getteximage-targets S3TC CUBE" test on Broadwell.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

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