Claude review: drm: uapi: Use SPDX in DRM core uAPI headers

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

Patch Review

**Documentation change (`Documentation/gpu/drm-uapi.rst`):**

The added paragraph is well-placed, directly after the discussion of uAPI review requirements and before the render nodes section:

```
+The DRM subsystem has however no concern with independent closed-source
+userspace implementations. To officialize that position, the DRM uAPI headers
+are covered by the MIT license.
```

Minor nit: "officialize" is not a standard English word — "formalize" would be more conventional. That said, the meaning is perfectly clear, and this has already been reviewed by multiple maintainers including Simona who participated in the original discussion, so this is not worth blocking on.

**Header changes (`drm.h`, `drm_fourcc.h`, `drm_mode.h`, `drm_sarea.h`):**

All four headers follow the same clean pattern:
1. Add `/* SPDX-License-Identifier: MIT */` as the very first line
2. Remove the verbose MIT license text
3. Preserve copyright notices and author attributions

The changes are mechanically correct. The SPDX tag is placed on line 1 as required by kernel convention, copyright lines are retained, and no functional code is touched. The slight variations in the removed license text (e.g., `drm.h` names "VA LINUX SYSTEMS", `drm_sarea.h` names "TUNGSTEN GRAPHICS", `drm_mode.h` uses "AUTHORS OR COPYRIGHT HOLDERS") are all correctly identified as MIT license variants and appropriately replaced by the single `MIT` SPDX identifier.

One observation: `drm.h` has a slightly unusual structure after the patch — it ends up with two separate comment blocks (one for the header description/author and one for the copyright notices). This is a pre-existing structure and the patch handles it correctly by inserting the SPDX tag before the first block and removing the license text from the second.

**No concerns.** The patch is clean, well-reviewed, and correct. Recommend merging.

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