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nouveau/drm: use new UAPI to determine the maximum exec size

Yusuf Khan requested to merge YusufKhan-gamedev/mesa:nouveau/drm_use_new_uapi_to_determine_exec_size into main

What does this MR do and why?

nouveau/drm: use new UAPI to determine the maximum exec size

The nv50+ path in the kernel seems to allocate a significantly
larger exec for its max exec size which means we dont need to
copiously submit buffers everytime it goes above 512.

Signed-off-by: Yusuf Khan <yusisamerican@gmail.com>

Marked draft since its only compile tested at the moment.

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