Claude review: drm/bridge: add of_drm_get_bridge_by_endpoint()

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

Patch Review

The new function is a clean wrapper around `of_drm_find_and_get_bridge()` with OF graph resolution. Key details look correct:

```c
bridge = of_drm_find_and_get_bridge(remote);
if (!bridge)
    return ERR_PTR(-EPROBE_DEFER);
```

This correctly converts the NULL return from `of_drm_find_and_get_bridge()` (bridge registered but not yet available) into `-EPROBE_DEFER`, matching the semantics of the old `drm_of_find_panel_or_bridge()`.

The non-OF inline stub correctly returns `ERR_PTR(-ENODEV)` rather than NULL, consistent with the new API contract.

**Very minor nit:** The kdoc return description is missing a trailing period:
```
 * Returns a pointer to the connected drm_bridge, or a negative error on failure
```

Already has R-by from Dmitry and Laurent. No issues.

---
Generated by Claude Code Patch Reviewer