supplicant(interface): Remove redundant callbacks

The information broadcast via these callbacks are already available via
other callbacks.

1. All of the onProvisionDiscovery* callback data can be retrieved via the
|onProvisionDiscoveryCompleted| callback.
2. OnAssociated & onConnected callbacks data can retrieved via the
onStateChanges callback.

Bug: 34221586
Test: ./hardware/interfaces/update-makefiles.sh

Change-Id: Ieee26013dfda7a9be41a80e98ff1537da16b3466