Claude review: vfio/pci: Provide a user-facing name for BAR mappings

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

Patch Review

Nice quality-of-life patch for debugging. Generates names like `vfio1234567890:ffff:ff:3f.7/5`.

**Direct access to `priv->dmabuf->name_lock`**:
```c
+	spin_lock(&priv->dmabuf->name_lock);
+	kfree(priv->dmabuf->name);
+	priv->dmabuf->name = bufname;
+	spin_unlock(&priv->dmabuf->name_lock);
```
This directly reaches into `struct dma_buf` internals rather than using the `DMA_BUF_SET_NAME` path. While functionally fine (and avoids an unnecessary `copy_from_user`), it's fragile if the dma-buf subsystem changes its internal locking. Consider using `dma_buf_set_name()` if one exists, or at minimum add a comment explaining why direct access is used.

**`#include <uapi/linux/dma-buf.h>`**: Kernel code should include `<linux/dma-buf.h>` rather than the UAPI header. The UAPI header is pulled for `DMA_BUF_NAME_LEN`, which should be available through the normal header.

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