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radeonsi: Fix copying the "alpha" channel for formats with X channel.

Bas Nieuwenhuizen requested to merge bnieuwenhuizen/mesa:dcc-fix-radeonsi into master

Otherwise we get the strange behavior that unmap + map clears the X channel to 1.0 if the texture is DCC compressed due to copying from and to a staging texture.

Counter proposal for !438 (closed)

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