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panfrost: vram tracking/reporting

Italo Nicola requested to merge italove/mesa:pan_vram_tracking into main

This MR aims to provide a way to debug VRAM usage in panfrost. Ideas about how to format the output are welcome. And also what other information would be useful to add.

We currently are not tracking "GROWABLE" BOs such as the tiler heap. That will either require a new ioctl or reading back from the descriptors.

cc @alyssa

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