Add disconnect cause when outgoing call fails due to ongoing OTASP prov.

Adding a new disconnect cause shown to the user when they attempt to place
a call when OTASP provisioning is in process.

Test: Manual with test intent.
Test: Added unit test.
Bug: 70843686
Change-Id: I5cecb79948c9467b4d297ac3ea06df6cc7fd41bd
1 file changed