Question Double tap to wake

It's the system. There is no specific app (well, there probably is a system component that handles it, but it's not going to be available to the user to modify or disable).
 
No, I mean it's the system in general that's handling it. I can't tell you the exact system component that's responsible, but for the general user, it's not going to help knowing which component it is anyway, since you can't do anything with it. (Unless you rooted the phone, in which case it could be risky to start fiddling with system components.)

Can you give a little more info about why you're looking for the exact system app/component that's responsible?
 

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