rambi: Updated touch major calibration and added box filter

Two smaller config updated to improve the performance of the rambi
touchpad.

BUG=chromium:337615
TEST=manual testing

Change-Id: I4c97ba121404529308d0a3eeac6914585576725d
Reviewed-on: https://chromium-review.googlesource.com/185059
Reviewed-by: Benson Leung <bleung@chromium.org>
Commit-Queue: Dennis Kempin <denniskempin@chromium.org>
Tested-by: Dennis Kempin <denniskempin@chromium.org>
1 file changed