Unregister pending listeners in UiccProfile#dispose.

When the profile is brought up, if the device is not provisioned or
the user is not unlocked, UiccProfile registers listeners for these
events. Once the event is received, the corresponding listener is
unregistered. However, it's possible that the profile is disposed
(e.g. the SIM removed) prior to the event occuring. In this case, the
listener would remain present; if a new SIM were inserted, it would be
re-registered, likely causing adverse behavior.

Ensure that any registered listeners are unregistered when a
UiccProfile is disposed, even if the event has not yet occurred.

Bug: 134530854
Test: Validated crash fix when removing SIM before unlock
Change-Id: I00a6735229b9b91a17f4dc4e9bb092e94b73304f