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crocus: fix some gen4/45/5 issues

Dave Airlie requested to merge airlied/mesa:crocus-gen45-fix-compressed-textures into main

One fix for direct mapping of compressed textures which happens on gen4/5 since we don't take the memcpy path.

Second fix for RGBX->RGBA blt copies on gen4/5 which need to fill in the alpha channel with one, fixes some deqp tests. Also limits which formats can take that path.

intel folks: the genxml needs an ack at least, it's very similiar to one I fixed before.

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