Claude review: drm/panfrost: Move shrinker initialization and unplug one level down

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Verdict: Looks correct.**

Moves `panfrost_gem_shrinker_init/fini` into `panfrost_device_init/fini` (mirroring Panthor), and renames `panfrost_gem_shrinker_cleanup` to `panfrost_gem_shrinker_fini` for consistency. The rationale is that the shrinker should be ready before `drm_dev_register()` is called.

The init/fini ordering looks correct:
- Init: `...perfcnt_init -> shrinker_init -> gem_init`
- Fini: `shrinker_fini -> perfcnt_fini -> jm_fini -> ...` (reverse order)

The function signatures are changed from `struct drm_device *` to `struct panfrost_device *` which makes sense since `panfrost_device_init` already works with `panfrost_device`.

**Note:** The error path in `panfrost_probe` loses the `drm_dev_unregister` call in `err_out2`. That's fine because `err_out2` was only for `panfrost_gem_shrinker_init` failure, which now happens inside `panfrost_device_init` (before `drm_dev_register` is called), so `drm_dev_unregister` would be wrong there.

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Generated by Claude Code Patch Reviewer