r600: fill in some missing tex formats
r600: fill in some missing tex formats

This improves shadowtex since the component ordering
is at least correct now, but I'm not sure how to
deal with texturing from a depth surface yet due to
differences in depth and color tile layouts.

Signed-off-by: Alex Deucher <bf84f557a1e54fd62cd73c6847f7d9df60e9fbef@gmail.com>

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