radv: Disable DCC for GENERAL layout and compute transfer dest.

Apps can use this for render feedback loops, where things are
defined if they render each pixel only once. However, DCC fails
here, as the level of coherence is a block not a pixel, so disable it.

This is also going to help implementing other stuff.

Even if we optimize this later to only happen if there actually is
a loop (if possible at all ...), then the machinery is still useful
to exclude images accessible by the SDMA queue when that is implemented.

Reviewed-by: Dave Airlie <[email protected]>
Tested-by: Dieter Nützel <[email protected]>

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