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radv: fix NGG streamout with VS and GPL on GFX11

Samuel Pitoiset requested to merge hakzsam/mesa:radv_fix_gpl_gfx11_ngg_streamout into main

With GPL it's not possible to know the primitive topology when compiling the pre-rasterization stages. For NGG, we use the maximum number of vertices per prim and rely on the hardware to ignore the extra bits for points/lines.

Though, this can't work for NGG streamout because the number of vertices per prim is used to compute a streamout offset. The only way to solve this is to pass the number of vertices per prim through a new user SGPR.

This fixes a bunch of streamout tests with Zink/RADV on GFX11.

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