anv/radv: clear color attachment assertion
Following up a misunderstanding on !186 (merged) I've also opened an issue on the validation layer : https://github.com/KhronosGroup/Vulkan-ValidationLayers/issues/678
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Following up a misunderstanding on !186 (merged) I've also opened an issue on the validation layer : https://github.com/KhronosGroup/Vulkan-ValidationLayers/issues/678