mako: touch: correct resolution and reduce threshold

Change the resolution to exact size, which is 2560-1 x 1536 -1 and
reduce the threshold for reduced report mode so that more accurate data
can be reported to framework to improve browser scroll effect.
This should work with firmware jitter filter enable.

Change-Id: I7a36c3dbdc38ec402749577dda515f81d27a6557