intel/fs: Don't handle texop_tex for shaders without implicit LOD

These will be lowered by nir_lower_tex() with the
lower_tex_when_implicit_lod_not_supported, so don't need the extra
handling here.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
14 jobs for !699 with r/lower-to-txl in 7 minutes and 2 seconds (queued for 2 seconds)
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Status Job ID Name Coverage
  Containers Build
passed debian #263052

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  Build+Test
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passed meson-gallium-swr #263053

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passed scons-llvm #263064

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passed scons-nollvm #263063

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passed scons-swr #263065

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