amdgpu: UAPI for AMDGPU usermode queues

Arvind Yadav requested to merge ArvindYadav/drm:userqueue_4feb into main

This patch series introduces libdrm support for AMDGPU usermode graphics queues. User queues is a method of GPU workload submission into the graphics hardware with minimum interfearance from kernel schedulers. In this method, a userspace graphics application can create its own workqueue and submit it directly in the GPU HW.

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