Revert "InputMapper refactor: Configure empty InputDevice"

Revert submission 23316821

Reason for revert: breaks touch on some devices b/284203485

Reverted changes: /q/submissionid:23316821
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c96ed759fb428c7b982c921611e5da05040e3cea)
Merged-In: Id957e51b53e48b874302b24b612554f3024aa87b
Change-Id: Id957e51b53e48b874302b24b612554f3024aa87b