Remove SimChangeListener from Tethering

SimChangeListener is obsolete. It is replace by
ACTION_CARRIER_CONFIG_CHANGED.

Test: as follows
    - built, flashed, booted
    - runtest frameworks-net passes (with --no-hidden-api-checks)
    - tethering/hotspot on/off
Bug: 111490073

Change-Id: I82644ea136f43869a953a1f7b72dc489fe90f380