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v3dv/format: use XYZ1 swizzle for three-component formats

Alejandro Piñeiro requested to merge apinheiro/mesa:review/remove-transparent-black-border-custom-code into master

So far for the formats E5B9G9R9_UFLOAT_PACK32 and B10G11R11_UFLOAT_PACK32 we were using a XYZW swizzle. But from Vulkan spec those are three-component, without alpha, formats. So we should use XYZ1 instead, as we were already doing for other three-component formats.

Curiously the only case where this raised a problem were when using clamp to border with transparent black. This change allows us to remove the code that handled only that specific case.

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