dbusconfiguration: lower cpu cycles while waiting

Put in a wait()

Tested-by: Ran on a system without config, noticed lower
cpu cycles

Change-Id: I7e59db2bd2f7d7a8fd8695a6277dfed1a86b8ab3
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/dbus/dbusconfiguration.cpp b/dbus/dbusconfiguration.cpp
index ae08cda..0a7c502 100644
--- a/dbus/dbusconfiguration.cpp
+++ b/dbus/dbusconfiguration.cpp
@@ -557,6 +557,7 @@
         while (1)
         {
             bus.process_discard();
+            bus.wait();
         }
     }
 }