Move InputDevicesChangedListener & other functions to InputManagerGlobal

Move InputDevicesChangedListener, getInputDevice() and
getInputDeviceIds(), along with their associated
functions have been moved from InputManager to
InputManagerGlobal.
Associated CL to create InputManagerGlobal: ag/21609952

Bug: b/267758905
Test: Pre-submit
Change-Id: Ib34ca46ec7582b2e0ea491136a9c7c72146a13a5
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:313b16e2424824e9d0b4f0b01088a7714388d983)
Merged-In: Ib34ca46ec7582b2e0ea491136a9c7c72146a13a5