Claude review: drm/connector: hdmi: Add support for 'link bpc' property

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

Patch Review

**Issue 1 (bug): `link_bpc` only set when output_bpc changes, not on initial modeset**

```c
if (old_conn_state->hdmi.broadcast_rgb != new_conn_state->hdmi.broadcast_rgb ||
    old_conn_state->hdmi.output_bpc != new_conn_state->hdmi.output_bpc ||
    old_conn_state->hdmi.output_format != new_conn_state->hdmi.output_format) {
        struct drm_crtc *crtc = new_conn_state->crtc;
        struct drm_crtc_state *crtc_state;

        new_conn_state->link_bpc = new_conn_state->hdmi.output_bpc;
```

The `link_bpc` assignment is **inside** the `if` block that only triggers when broadcast_rgb, output_bpc, or output_format have changed from the old state. On the **first** modeset (or any modeset where these values happen to be the same as previous), `link_bpc` will remain at its default of 0 (zero-initialized connector state), which is below the range minimum of 8.

The `commit_tail` code will then see `old_conn_state->link_bpc (0) != new_conn_state->link_bpc (0)` — actually they'd be equal so it wouldn't fire, but the property would remain stale at its initial `max_bpc` value rather than reflecting the actual output_bpc.

The assignment should be moved **outside** the if block, to unconditionally set `link_bpc` to `hdmi.output_bpc`:

```c
new_conn_state->link_bpc = new_conn_state->hdmi.output_bpc;

if (old_conn_state->hdmi.broadcast_rgb != new_conn_state->hdmi.broadcast_rgb ||
    ...
```

This was actually what the cover letter's diff stat area suggests (the `+` line before the `crtc_state` block), but in the actual diff the assignment ended up inside the conditional. Looking at the diff more carefully, the `+` lines show it placed right after the opening brace of the if block. This is a real bug — on initial enable the link_bpc won't be set to the actual value.

**Patch 2 otherwise looks correct:** The `drmm_connector_hdmi_init` integration properly attaches the property after `max_bpc` is set up, and the error return is properly wired.

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