Move touchpad kcm_init phase
Touchpad's kcminit only sets some x atoms on an alrady running X.
There's an argument that we want this done before all the apps restore,
but we don't need to delay starting plasmashell for this.
Phase 1 happens between these two points.
For wayland libinput this does nothing anyway
For the new X libinput this does nothing anyway
Test Plan: Read code.
Reviewers: Plasma, hein
Reviewed By: Plasma, hein
Differential Revision: https://phabricator.kde.org/D9200