By Kameron Duncan The Dallas Cowboys are aiming to win the NFC East after a big win over the Philadelphia Eagles last Sunday night, and help could be on the way in the form of a rookie defender recovering from an injury. The team began the 21-day practice window for defensive tackle Viliami “Junior” Fehoko on Thursday, allowing him to join the team after a four-week absence. Fehoko suffered a knee injury last month that landed him on injured reserve, and he is attempting to make it back before the end of the regular season. The team has 21 days to add Fehoko to the active roster or place him b…