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backend-drm: Refactor backend for Multi-GPU support

Michael Tretter requested to merge m.tretter/weston:refactor-drm-backend-for-multi-gpu into main

Multi-GPU support !736 (merged) requires quite some refactoring in the DRM backend, since the drm device must be separated from the drm backend to allow multiple devices in the backend.

This merge request prepares the drm backend for Multi GPU support without changing the behavior of the backend. Adding support for multiple GPUs is still left to !736 (merged), which depends on this merge request.

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