vc4: Fix subimage accesses to LT textures.
This code started out like the T case, iterating over utile offsets, but I had partially switched it to iterating over pixel offsets. I hadn't caught this before because it's unusual to do piecemeal uploads to small textures. Fixes bad text rendering in QT5 apps, which use a 256x16 glyph cache. Also fixes 6 piglit tests related to glTexSubImage() and glGetTexSubImage(). Cc: "11.1 11.2" <firstname.lastname@example.org>
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