Claude review: arm64: dts: rockchip: rk3399-evb-ind: Add support for DisplayPort

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

Patch Review

Board-level DTS additions for the EVB IND board. Adds fusb302 Type-C controller, connector description, DP PHY linkage.

**Issue (minor): `sound` node uses `rockchip,rk3399-gru-sound` compatible.** The RK3399 EVB IND is not a Gru-based Chromebook. Using the Gru sound compatible may not be appropriate for this board unless the audio setup is identical. This should be verified against the actual hardware.

**Observation:** The `vdo = <0x00001c46>` value in the DP altmode node -- the changelog mentions "Fix wrong vdo value" from v3. The value encodes DP capabilities; it should be reviewed by someone with access to the hardware spec.

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## Summary of Issues Requiring Action

1. **Bug (must fix):** Patch 7 - `prev_port` uninitialized in `cdn_dp_bridge_edid_read()`. Initialize to `NULL`.
2. **Bug (must fix):** Patch 6 - `PTR_ERR(extcon) != -ENODEV` check fires on valid extcon pointers, breaking existing boards. Needs `IS_ERR(extcon) &&` guard.
3. **Bug (should fix):** Patch 7 - `cdn_dp_connected_port()` lost the `lanes` check for the extcon path, returning first port even with 0 lanes.
4. **Should fix:** Patch 1 - `to_typec_altmode()` cast before type check; ignored error return; missing `__exit`.
5. **Should fix:** Patch 4 - fwnode handle leaks in `tcphy_setup_orien_switch()` and `tcphy_setup_typec_mux()`.
6. **Minor:** Various naming inconsistencies and style nits.

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Generated by Claude Code Patch Reviewer