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nvk: fix transform feedback with multiple saved counters.

Dave Airlie requested to merge airlied/mesa:nvk-fix-xfb into main 
nvk: fix transform feedback with multiple saved counters.

The SET_STREAM_OUT_BUFFER_LOAD_WRITE_POINTER registers have an
8 dword stride, but the code is only adding one dword between them
then the MME is calling an illegal method.

This is the simple fix, otherwise I think we'd have to multiply
somehow in the MME which seems pointless.

Fixes KHR-GL45.transform_feedback* on zink on nvk.

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