fix: use mlxconfig to set LINK TYPE P1

[almaslennikov]

LINK_TYPE_P2 is not available on CX8 so DMS breaks on this command

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Greptile Overview

Greptile Summary

This PR updates the Spectrum-X reference configs (RA1.3/RA2.0/RA2.1) to set Ethernet mode via mlxconfig instead of DMS, using LINK_TYPE_P1=2 (Ethernet). This aligns with the operator’s Spectrum-X config application flow (nvConfig entries are split into mlxconfig vs DMS parameters) and avoids relying on LINK_TYPE_P2, which is not available on CX8 per the PR description.

I didn’t find any must-fix issues in the changes themselves: the Spectrum-X config loader expects ConfigurationParameter.Value as a string, and YAML numeric scalars like 2 will be unmarshaled to the string field as "2", so the mlxconfig apply/check paths should work as intended.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• Changes are limited to bindata Spectrum-X YAML templates and switch Ethernet mode to an existing, well-supported nvconfig parameter (LINK_TYPE_P1) with the correct numeric value for Ethernet. Repo code supports mlxconfig-only parameters and explicitly tolerates absence of LINK_TYPE_P2 on dual-port devices when it’s not available.
• No files require special attention

Important Files Changed

Filename	Overview
bindata/spectrum-x/RA1.3.yaml	Switch 'Ethernet mode' from DMS interface type to mlxconfig LINK_TYPE_P1=2 (Ethernet); rest unchanged.
bindata/spectrum-x/RA2.0.yaml	Switch 'Ethernet mode' from DMS interface type to mlxconfig LINK_TYPE_P1=2 (Ethernet); rest unchanged.
bindata/spectrum-x/RA2.1.yaml	Switch 'Ethernet mode' from DMS interface type to mlxconfig LINK_TYPE_P1=2 (Ethernet) in nvConfig; rest unchanged.

Sequence Diagram

sequenceDiagram
    participant Reconciler as SpectrumXConfigManager
    participant Loader as LoadSpectrumXConfig(YAML)
    participant Splitter as getNvConfigParameters
    participant NV as nvConfigUtils (mlxconfig)
    participant DMS as DMS Client

    Reconciler->>Loader: Read bindata/spectrum-x/RA*.yaml
    Loader-->>Reconciler: SpectrumXConfig (nvConfig params)
    Reconciler->>Splitter: Separate nvConfig into mlxconfig vs dmsPath
    Splitter-->>Reconciler: mlxconfigParams, dmsParams

    Note over Reconciler,NV: This PR moves "Ethernet mode" to mlxconfig
    Reconciler->>NV: SetNvConfigParameter(LINK_TYPE_P1, "2")
    NV-->>Reconciler: ok / error

    alt other DMS-based parameters present
        Reconciler->>DMS: SetParameters(dmsPath, valueType, value)
        DMS-->>Reconciler: ok / error
    end

    Reconciler->>NV: QueryNvConfig(LINK_TYPE_P1)
    NV-->>Reconciler: CurrentConfig includes "2" => applied

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