r600g: properly implement S8Z24 depth-stencil format for Evergreen

I should say "fix", but it has never been used until now.
S8Z24 is the format equivalent to the GL_UNSIGNED_INT_24_8 packing,
so we'll start to see it more often with st/mesa now making smart decisions
about formats.

The DB<->CB copy can change the channel ordering for transfers, other than
that, the internal DB format doesn't really matter.

R600-R700 support is possible except shadow mapping.
FMT_24_8 is broken if the SAMPLE_C instruction is used (no idea why).

Also the sampler swizzling was broken in theory and the fact it worked was
a lucky coincidence.

radeonsi might need to port this.

Reviewed-by: Jerome Glisse <[email protected]>

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