origin: Add id property and adapt to changes

The id property will be used to keep track of which origin was used for a call,
so that we can default to reusing the same origin when placing a call from the
history.

plugins/mm/calls-mm-origin.h

@@ -34,7 +34,8 @@ G_BEGIN_DECLS
 
 G_DECLARE_FINAL_TYPE (CallsMMOrigin, calls_mm_origin, CALLS, MM_ORIGIN, GObject);
 
-CallsMMOrigin *calls_mm_origin_new (MMObject *modem);
+CallsMMOrigin *calls_mm_origin_new (MMObject   *modem,
+                                    const char *id);
 gboolean       calls_mm_origin_matches (CallsMMOrigin *self,
                                         MMObject      *modem);