Claude review: drm/amd/display: use plane color_mgmt_changed to track colorop changes

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

Patch Review

**Author:** Melissa Wen

Wires up the new `plane_state->color_mgmt_changed` flag in AMD's display driver, at two critical decision points:

1. **`amdgpu_dm_commit_planes()`** (line 10218): The condition for sending color surface updates to DC now checks `new_plane_state->color_mgmt_changed` in addition to `new_pcrtc_state->color_mgmt_changed`:

   ```c
   if (new_pcrtc_state->color_mgmt_changed || new_plane_state->color_mgmt_changed) {
   ```

   This ensures that when a colorop property changes (e.g., shaper/3D-LUT update for gamescope night mode), the driver actually sends the updated gamma, transfer functions, gamut remap, HDR mult, shaper, 3D LUT, and blend TF to DC.

2. **`should_reset_plane()`** (line 12060–12062): Returns `true` when `new_plane_state->color_mgmt_changed` is set, causing the plane to be removed from and re-added to the DC state. This is the same behavior already triggered by `new_crtc_state->color_mgmt_changed`.

**Verdict:** Correct, minimal, and directly fixes the reported gamescope issue. No issues.

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