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The IORT specification (Revision E.b, Table 12) defines the ITS Group Node structure with an ITS Identifiers array following the node header. Although the IORT table is zero-initialized, this commit adds an explicit write of the ITS identifier value (0) for clarity and spec compliance. This ITS identifier must match the `translation_id` field in the MADT GIC ITS structure to ensure proper interrupt routing on ARM platforms. Signed-off-by: Bo Chen <bchen@crusoe.ai>