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nir/lower_fragcolor: handle dual source blending

Danylo Piliaiev requested to merge Danil/mesa:nir/fix/nir_lower_fragcolor-dual-src-blend into master

With dual source blending only 1 draw buffer could be used.

For zink fixes tests:

 arb_blend_func_extended-fbo-extended-blend-pattern_gles2

I'm not sure at which exact point things go wrong without this fix, but I think it's definitely wrong to write into draw buffers that are above the limit.

Found while fixing the same test for freedreno.

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