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v3d/format: use XYZ1 swizzle for three-component formats

Alejandro Piñeiro requested to merge apinheiro/mesa:review/v3d-xyz1-for-three-component-formats into master

R11G11B10_FLOAT and R9G9B9E5_FLOAT are three-component formats, so we shouldn't use 1 for the alpha component.

We don't know about any test/app getting fixed with this change, but it is the equivalent to v3dv commit e07c5467. Vulkan CTS has some tests that used that format and failed if not using XYZ1.

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