It was for the championship, you play until you have a winner no matter how long it takes.
Not in soccer.
By the way, i believe the overtime in hockey playoffs should be altered. Some of those games last 2 and 3 overtime periods. This is way too long and there are already too many playoffs games. The only reason they're now all best of 7's is purely for cash-grab reasons by the dick millionaire and billionaire owners.
Overtime periods in the playoffs should be like the season: 4 on 4 hockey, but for an entire 20 minute period.