b/12068020 Update calls to InputManager. Do not merge

This is a cherry-pick of https://googleplex-android-review.git.corp.google.com/#/c/400419/

This is part of work on making key layouts get saved per vendor/product
instead of per device. The corresponding change in fw is
https://googleplex-android-review.git.corp.google.com/#/c/399886/
This changes all uses of InputDevice descriptor to InputDeviceIdentifier.

Change-Id: I9072c5b5c822b73188a6c572945f87b4a7c03139