Shift notifyConfigurationChanged policy call to InputReader

WM expects input devices to be updated on receiving notify
configuration changed callback, but currently the policy callback
for input devices changed is sent after configuration changed,
causing stale device info provided to WM.

Bug: 350416243
Test: atest inputflinger_tests
Flag: NONE bugfix
Change-Id: If6c9d50459c4b1d72d0a2774b4fc833d6522a095