INFJ's and attention disorders don't mix in my eyes. That isn't to say it isn't possible (it certainly is), although it is not common.
While Ni often has a lot of tangential thought patterns, that can seen disorganized, there is often some kind of order to it. Ni is actually pretty organized, just in its own right. Also, because our Ni is filtered through Fe, which is a judging function, it helps solidify Ni into something that can be held and possibly categorized. Fe likes to connect with people, and lots of people, but in an orderly fashion, while still adhearing to a set of "social rules". INFJ's often are prone to having intrusive thoughts, which can cause the mind to drift, but this doesn't really relate to an attention decefict. We often want to focus on something when we need to, but our mind blocks us out from doing so, which is not attention decefict.
The most prone types to attention disorders are the EP's, the least are IJ's.