A full 20 years after he co-formed North Mississippi Allstars with his brother Luther, Cody Dickinson, the band’s drummer, delivers his first proper solo album. It won’t surprise any fans that, like the NMAS and Cody Dickinson’s Hill CountryRevue, Leeway for the Freeway is 100 percent devoid of pretense and glitz. If your task was to demonstrate genuine contemporary American roots music…