News of Jax Teller’s revival was major. But if Charlie Hunnam had his way, the Sons of Anarchy surprise would have stayed secret for longer. “My desire was to keep it as secret as possible, but there were a couple of very tenacious news organizations that had gleaned that we were doing something (laughs), so FX wanted to get out ahead of it,” Hunnam now tells The Hollywood Reporter about last month’s viral announcement about the Sons of Anarchy spinoff. On Aug. 19, FX announced that Sons of Anarchy, which signed off in 2014 after seven seasons, would be returning with a limited series, with Hunnam reprising his titular role, along with…