American industries of all sorts — autos, textiles, steel and even software — are being battered by lower-cost competition from abroad. But the U.S. entertainment sector is poised to profit amid the onslaught, say Hollywood executive Jeff Berg and Wall Street investor Suhail Rizvi.   Granted, both men have their biases: They have placed big bets on Tinseltown. Berg, chairman of International Creative Management, a talent agency, has made his career in Hollywood; Rizvi, chief of Rizvi Traverse Management, a private equity firm, recently invested (along with Merrill Lynch) about $100 million in ICM. But Berg and Rizvi’s partnership rests on clear-eyed strategic reasoning, not a shared fascination with the glittery side of the business. “The production of media may go to other places, but the content will still be owned by U.S. companies, and that’s where the value lies,” Rizvi says. In addition, people all over the world eat up American entertainment.…