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