radeonsi: fix texture reinterpretation after DCC fast clear

The problem is that TC-compatible DCC clear codes translate
into different clear values when you change the format.

I have a new piglit reproducing the issue.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
1 file changed