[eCall] Correctly retrieve call termination reason
[eCall] Correctly retrieve call termination reason

The eCall termination reason is now correctly retrieved when the call is
rejected by the PSAP before being established.

Resolves: LE-5471
Change-Id: I5527416d4d89b528e89abf2e99d74a4dd8c1c46c

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af