core,log: include logging from the 'Qmi' log domain

Sync with libqmi:

commit 2835a53732fdae32478dd954a9ee3fa8afd93cab
Author: Aleksander Morgado <aleksander@lanedo.com>
Date:   Tue Oct 30 15:02:24 2012 +0100

    libqmi-glib: define library G_LOG_DOMAIN

src/mm-log.c

@@ -236,6 +236,13 @@ mm_log_setup (const char *level,
                        log_handler,
                        NULL);
 
+#if defined WITH_QMI
+    g_log_set_handler ("Qmi",
+                       G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION,
+                       log_handler,
+                       NULL);
+#endif
+
     return TRUE;
 }