Claude review: drm/msm/hdmi: switch to of_drm_get_bridge_by_endpoint()

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

Patch Review

This is the most involved conversion because the MSM HDMI driver's bridge is in a separate `hdmi_bridge` struct (allocated in `hdmi_bridge.c`), not embedded in the `hdmi` struct. So unlike later patches, this one can't use the auto-put `bridge.next_bridge` field and must manage the refcount explicitly.

The conversion correctly:
- Handles the `-ENODEV` case by setting `hdmi->next_bridge = NULL` (preserving old behavior)
- Changes all early-return paths after the bridge lookup to `goto err_put_bridge`
- Adds `drm_bridge_put(hdmi->next_bridge)` in both `err_put_bridge` and `msm_hdmi_dev_remove()`

The `drm_bridge_put()` in the remove function is safe even if `next_bridge` is NULL (patch 1 ensures this).

**Minor nit:** There's a double blank line introduced at the `devm_clk_bulk_get` error path:
```c
 	if (ret)
-		return ret;
+		goto err_put_bridge;
+
 
 	hdmi->extp_clk = devm_clk_get_optional(dev, "extp");
```

No functional issues. This patch needs review/ack from MSM maintainers.

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