Merit Financial plans to rev up its subprime business in the months ahead through a program that will provide mortgages for employees of coffee giant Starbucks. The partnership with Starbucks is part of a “zero cost” employer benefit program launched by Merit in May. The Washington-based company touts the program, which features educational seminars that teach employees about the ins-and-outs of getting a mortgage and using their home equity to pay off debt as…