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panfrost: ZS texture sampling fixes

Boris Brezillon requested to merge bbrezillon/mesa:panfrost-zs-fixes into master

I got things wrong in !7922 (merged). According to the TGSI doc (section Texture Sampling and Texture Formats in docs/gallium/tgsi.rst), depth and stencil components should be replicated on all components, and the simple TGSI shaders were correct. Fix the panfrost driver so we can revert the faulty patch (requires some changes to Zink).

/cc @imirkin @anholt

Edited by Boris Brezillon

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