Claude review: drm/mediatek: mtk_cec: Fix non-static global variable

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

Patch Review

```c
-struct platform_driver mtk_cec_driver = {
+static struct platform_driver mtk_cec_driver = {
```

Correct. `mtk_cec_driver` is only used at the definition and via `module_platform_driver()` in `mtk_cec.c`. The Fixes tag points to `1e914a89ab7e` which switched it to `module_platform_driver` registration — this is the commit that made the variable no longer need external linkage, so the Fixes tag is appropriate.

Note: unlike patches 1 and 2, this patch does not have `Reported-by: kernel test robot` — the cover letter explains these two (patches 3 and 4) are "two others introduced during v6.16 development cycle" that were found separately. This is fine.

**Reviewed-by worthy. No issues.**

---
Generated by Claude Code Patch Reviewer