iris/resource: Drop redundant checks for aux support

Drop some checks that are already done by ISL.

Reviewed-by: Rafael Antognolli <rafael.antognolli@intel.com>
10 jobs for master in 16 minutes and 2 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Containers Build
passed debian #298123

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  Build+Test
passed meson-clang #298125

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passed meson-clover #298129

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passed meson-main #298128

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passed meson-swr-glvnd #298124

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passed meson-vulkan #298130

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passed scons-llvm #298132

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passed scons-nollvm #298131

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passed scons-swr #298126

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passed scons-win64 #298127

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