(Reuters) - Interdealer broker TP ICAP said on Friday former JPMorgan Chase executive Richard Berliand would join as chairman-designate early next year, taking over from Rupert Robson, who is set to retire after 12 years on the board.The change comes months after the world's largest financial broker fired CEO John Phizackerley and warned rising costs would hurt profits this year.Berliand, a 23-year veteran of JPMorgan and currently a member of Deutsche Börse AG's supervisory board, will..