Revert "Add @SysUISingleton to repository switcher classes"

Revert submission 23033485

Reason for revert: Probable culprit for b/281706473

Reverted changes: /q/submissionid:23033485
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:12c0f856b9f69c9954552af7e04a48f726f561cf)
Merged-In: Ie67c963784bdf3dc25954f950a551c4a7aa97389
Change-Id: Ie67c963784bdf3dc25954f950a551c4a7aa97389