Claude review: drm/edid: extract section header processing into helper

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

Patch Review

**Purpose:** Refactors `update_displayid_info()` to extract the header processing into `drm_displayid_process_section_header()`, removes the `break` so the iterator can walk all blocks.

**Correctness:** The logic is preserved correctly. The `header_processed` flag ensures the header is processed only once, and removing the `break` is necessary for Patch 2 to iterate to the Display Parameters block.

**Style issues:** The new helper has inconsistent indentation compared to the original code and kernel coding style:

```c
	drm_dbg_kms(connector->dev,
			"[CONNECTOR:%d:%s] DisplayID extension version 0x%02x, primary use 0x%02x\n",
			connector->base.id, connector->name,
```

The format string arguments should align with the opening parenthesis of `drm_dbg_kms`, as the original code did:

```c
		    "[CONNECTOR:%d:%s] DisplayID extension version 0x%02x, primary use 0x%02x\n",
```

Similarly, the `if` condition:

```c
	if (displayid_version(iter) == DISPLAY_ID_STRUCTURE_VER_20 &&
		(displayid_primary_use(iter) == PRIMARY_USE_HEAD_MOUNTED_VR ||
			displayid_primary_use(iter) == PRIMARY_USE_HEAD_MOUNTED_AR))
```

The original code had proper alignment with the condition on the `if`:

```c
	    (displayid_primary_use(&iter) == PRIMARY_USE_HEAD_MOUNTED_VR ||
	     displayid_primary_use(&iter) == PRIMARY_USE_HEAD_MOUNTED_AR))
```

These are minor but inconsistent with both the original code and typical kernel style.

**No functional concerns.**

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Generated by Claude Code Patch Reviewer