Refactor EventHub.

1. Remove linked list from Device.
2. Use STL containers for EventHub mDevices, mOpeningDevices,
mClosingDevices.
3. Move device operation functions to Device member functions.

Bug: 160010896
Test: atest libinput_tests, atest inputflinger_tests

Change-Id: I36f09ec93e92b9b527b38b66a3f8a3de94a3afa1