STOCKHOLM (Reuters) - Activist investor Cevian Capital has trimmed its holding in Sweden's Ericsson to 7.4% of share capital, saying the telecom equipment maker's share of Cevian's portfolio had become too large.A filing with the U.S. Securities and Exchange Commission on Friday showed Cevian had cut its stake by about 34 million B-shares and now held 246.9 million B-shares and 339,228 A-shares in Ericsson. Cevian previously held an 8.4% stake in Ericsson. "With our divestments we have now..