[eCall] Set correct session state after call end
[eCall] Set correct session state after call end

Set the eCall session state to STOPPED after the call has been closed. This allows initiating another eCall after the first one with the same eCall reference.

Resolves: LE-5540
Change-Id: If1b9b1afb84544b87e81230924ebf93f86fdb9e0
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