drm: TODO: Add DRM_MODESET_LOCK_ALL* conversion to todo.rst

GEM objects can now have a function table instead of having the callbacks on the

DRM driver struct. This is now the preferred way and drivers can be moved over.

Use DRM_MODESET_LOCK_ALL_* helpers instead of boilerplate

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For cases where drivers are attempting to grab the modeset locks with a local

acquire context. Replace the boilerplate code surrounding

drm_modeset_lock_all_ctx() with DRM_MODESET_LOCK_ALL_BEGIN() and

DRM_MODESET_LOCK_ALL_END() instead.

This should also be done for all places where drm_modest_lock_all() is still

used.

As a reference, take a look at the conversions already completed in drm core.

Contact: Sean Paul, respective driver maintainers

Core refactorings

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