use heap hint with dilithium benchmark

[JacobBarthelmeh]

No description provided.

[Copilot]

Pull request overview

Updates the Dilithium benchmark to initialize keys with an explicit heap hint/device id, aligning it with APIs that support custom heap usage.

Changes:

• Switch Dilithium benchmark initialization from wc_dilithium_init to wc_dilithium_init_ex using HEAP_HINT and devId
• Update the corresponding error message to reference the new init API

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