MVKPixelFormats: Add support for more B8G8R8A8 formats using swizzle. #2405
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Similar to #2383, adds support for some more B8G8R8A8 formats using swizzle.
I've tested this with B8G8R8A8 storage images in shadPS4. We don't have proper support for emulating arbitrary storage image swizzles used by the emulated game yet, but we have a simple path for emulating RGBA -> BGRA storage image swizzles that changes out the Vulkan format. Adding these formats helps us with that.