Remove orientation sensor

Summary:
This functionality will instead be implemented in KScreen such that manual and
automatic output rotation can be used and configured through a single UI in
unison together.

Test Plan: Compiles.

Reviewers: #kwin, davidedmundson, zzag

Reviewed By: #kwin, zzag

Subscribers: kwin, bshah, davidedmundson, zzag

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D26036