Look, in all honesty I don't think it was planned by Modi like you said earlier. Sure - now more people who didn't like to get woken up the prayers/listening to them on the loudspeakers are coming out and complaining openly- it doesn't seem like this was a part of some secret BJP agenda.
Coming out openly and speaking about a cause like this only serves to destroy one's Bollywood career. An example of this : Abhijeet Bhattacharya- Another Bollywood singer who doesn't make it to any mainstream major films now due to his explosive comments on TV.
Maybe Sonu was just really tired of being woken up by the Azaans every morning.