edgetpu: remove debug dump feature Remove unused debug dump feature (and reclaim associated coherent memory). Bug: 337348834 GitOrigin-RevId: 87f253ce3993d4158ef694fb38cb9c34acf19754 Change-Id: I67748b4d4e8876755553bc5cbf82343cf7544284 Signed-off-by: Todd Poynor <[email protected]>