radv: Add ETC2 emulation.

Bas Nieuwenhuizen requested to merge bnieuwenhuizen/mesa:emulate-etc2 into main

ETC is super required for Android. Given that Renoir and all the RDNA based GPUs don't support ETC2 we have to emulate it.

This achieves that by adding a second plane to each image with the decoded data. We sync it after each transfer operation.

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