Revert "Add device-specific tunings for external touchpads"

Revert submission 21750284-touchpad-specific-tuning

Reason for revert: resolves flake b/272308130 according to culprit assistant https://android-build.googleplex.com/builds/culprit-assistant/run/6257e5da-1bb0-437a-8fab-f04c27d462b3 verified by 6 runs in abtd https://android-build.googleplex.com/builds/abtd/run/L75900000959044402

Reverted changes: /q/submissionid:21750284-touchpad-specific-tuning

Change-Id: Ie28915d535c3da7d3c689a80348d3cb796658fa1