The lawyer who defended Chicago police officer Jason Van Dyke on murder charges — described in a new documentary as “one of the most closely watched trials in the city’s history” — said he is shifting his practice to one less focused on criminal or civil litigation.The shift for Daniel Q. Herbert, a former Chicago policeman who built a business around defending law enforcement officers, comes about eight months after the Fraternal Order of Police, Lodge No. 7, voted to stop referring cases to …