lima: use plain BOs for gl_pos and varyings

Suballocator doesn't really fit here since it can't resize backing BO.

Fixes crash in glmark2-es2-drm -b refract

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
14 jobs for !663 with lima-drop-suballocator in 9 minutes and 19 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Containers Build
passed ubuntu #239966

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  Build+Test
passed meson-clang #239968

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passed meson-gallium-clover-llvm #239974

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passed meson-gallium-clover-llvm39 #239975

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passed meson-gallium-drivers-other #239973

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passed meson-gallium-radeonsi #239972

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passed meson-gallium-st-other #239976

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passed meson-gallium-swr #239967

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passed meson-glvnd #239971

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passed meson-loader-classic-dri #239970

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passed meson-vulkan #239969

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passed scons-llvm #239978

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passed scons-nollvm #239977

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passed scons-swr #239979

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