radeonsi/nir: always lower ballot masks as 64-bit, codegen handles it

This fixes KHR-GL45.shader_ballot_tests.ShaderBallotBitmasks.

This solution is better, because the IR isn't dependent on wave32.
17 jobs for !1659 with general-improv in 16 minutes and 7 seconds (queued for 4 seconds)
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  Containers Build
passed debian #515916

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  Build+Test
passed meson-arm64 #515925

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passed meson-armhf #515924

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passed meson-clang #515918

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passed meson-clover #515922

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passed meson-i386 #515926

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passed meson-main #515921

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passed meson-swr-glvnd #515917

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passed meson-vulkan #515923

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passed scons-llvm #515928

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passed scons-swr #515919

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passed scons-win64 #515920

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  Test
passed test-llvmpipe-gles2 1/4 #515929

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passed test-llvmpipe-gles2 2/4 #515930

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passed test-llvmpipe-gles2 3/4 #515931

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passed test-llvmpipe-gles2 4/4 #515932

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