By Katharina Bart ZURICH (Reuters) - Credit Suisse said its drive to cut costs, risky assets and focus on its investment bank were bearing fruit as its quarterly earnings beat analysts' expectations and it raised the prospect of a cash dividend this year. The results are a boost to the Swiss bank's argument that its slimmed-down investment bank can prosper despite lacking the scale of Wall Street giants like JP Morgan and Goldman Sachs . Swiss rival UBS is largely pulling out of fixed income to focus on private banking. ...