For Goldman Sachs, the narrowing of focus continues.And in the latest earnings report, released Tuesday (Jan. 16), the Wall Street firm detailed its progress toward jettisoning some of its credit card operations, selling GreenSky and moving away from its once-lofty Main Street banking ambitions.Supplemental materials released in tandem with earnings showed its provision for credit losses in the most recent quarter at $399 million in the Consumer Platforms division, which houses the card operations and trans ...