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etnaviv: Support creating screens with separate 3D GPU and NPU cores.

Philipp Zabel requested to merge pH5/mesa:etnaviv-gpu-and-npu into main

What does this MR do and why?

Allow etnaviv to run a compute-only context on a (secondary) NPU when the primary device is a 3D GPU.

Rework the winsys etna_gpu iteration to stop aborting when the first GPU was found, and instead collect both 3D GPU and and NPU when available, and pass them to etna_screen_create() separately.

Add a separate NPU pipe and collect specs from both GPU and NPU.

Broken out from !27769 to address pH5/mesa@6c9802f4 (comment 2387220).

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