By Trevor Hunnicutt CARLSBAD, Calif. (Reuters) -U.S. President Joe Biden, battling to show restive voters he has boosted the economy, touted his economic policies on Friday and said he is planning a talk with oil companies, as he predicted Democrats will prevail in Tuesday’s midterm elections despite polls showing Republican gains. On a three-day, four-state campaign swing, Biden stopped at Viasat Inc., a U.S. communications firm in Carlsbad, California, to tout efforts to increase semiconductor chips production and resolve supply chain issues that erupted early in his presidency. With some Re…