PHILADELPHIA — Philadelphia City Council has taken the first step toward putting horse stables in East Fairmount Park that could serve as a much-needed base for at least some of the city’s iconic urban riders, the focus of the fictionalized 2021 Netflix film “Concrete Cowboy.” Though formal plans are still months away, Council introduced an ordinance Thursday that would allow animal husbandry on a several-acre wedge of land off Reservoir Drive between Sedgley Woods and Kelly Drive that officials are eying for the “Stables at the Cliffs.” The ordinance is necessary to allow for care and stabli…