intel: workaround VS fixed function issue on Gen9 GT1 parts

The issue is noticeable in the
dEQP-GLES31.functional.geometry_shading.layered.render_with_default_layer_3d
test where a triangle goes missing when we use the maximum number of
URB entries as specified by the documentation.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107505
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>
14 jobs for !704 with review/gt1-vs-urb-fix in 11 minutes and 15 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Containers Build
passed debian #255653

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  Build+Test
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passed meson-gallium-clover-llvm #255661

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passed meson-gallium-clover-llvm39 #255662

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passed meson-gallium-drivers-other #255660

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passed meson-gallium-radeonsi #255659

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passed meson-gallium-st-other #255663

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passed meson-gallium-swr #255654

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passed meson-glvnd #255658

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passed meson-loader-classic-dri #255657

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passed meson-vulkan #255656

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passed scons-llvm #255665

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passed scons-nollvm #255664

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passed scons-swr #255666

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