Add touch fuzz to improve ovation sensitivity.

Fuzz has been added to the touch to better register touches.
The settings are: fuzz_x=3 and fuzz_y=5.
This makes ovation better register touches as a single touch
rather than a drag. Motion less than fuzz is registered as a
single touch. It greatly helps selecting items and page
turning while reading books.

I tries other values from 2 to 25 and found these to work
the best.
Commit taken from David R. Marble
Change-Id: I237dc9e5854be8045fa3871e4d2a6b46bda7e6bd