Use MODE.PREFILL and MODE.DECODE instead of strings in modules #37790
Description
ref: Slack conversation with @alingTT -- https://tenstorrent.slack.com/archives/D09M3L7MVE1/p1770953111380889
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ref: Slack conversation with @alingTT -- https://tenstorrent.slack.com/archives/D09M3L7MVE1/p1770953111380889