xorg-conf: Make the touch noise filter specific to Link

BUG=chromium:317827
TEST=grep Noise /var/log/Xorg.0.log
     Make sure the TouchNoiseFilter is enable on Pixel but not other
     platforms.

Change-Id: Ie01b5a52b3f98d334d2a82515b277feb532031df
Reviewed-on: https://chromium-review.googlesource.com/176351
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
Commit-Queue: Yufeng Shen <miletus@chromium.org>
Tested-by: Yufeng Shen <miletus@chromium.org>
2 files changed