Deviated septum is very common. Estimates of 80% of all adults have a deviated septum. Not everyone with a deviated septum is symptomatic or requires a septoplasty though.
It is unlikely that deviated septum causes persistent throat infections. Deviated septum and nasal congestion may contribute to throat irritation, but it is not a major contributing factor. Usually patients have nasal obstruction from a deviated septum, swollen turbinates, allergies, and sinus problems. These patients are unable to breath through the nose during sleep. The nose should warm and humidify the air we breathe. As a result, the throat may feel dry and irritated when they wake up.
Speak to a head and neck specialist to evaluate your symptoms first.