Add OemExtension callbacks support

To get NFC state updates to registered Apps
- RF field On/Off
- CE Activated/Deactivated
- RF discover started/stopped

Bug: 329043522
Test: Manual test discovery on/off, RF Field ON/OFF, CE Activated or Not.
Change-Id: Id6a6d84804a79ef0696509f87cd1c97223ce7c35