Create new 'gprs-sgsn' branch on top of 'gprs-conf'

This branch contains the partial SGSN/GGSN implementation that
was originally developed as part of the gprs branch.
diff --git a/openbsc/include/openbsc/debug.h b/openbsc/include/openbsc/debug.h
index f1c5a69..49b417e 100644
--- a/openbsc/include/openbsc/debug.h
+++ b/openbsc/include/openbsc/debug.h
@@ -29,6 +29,7 @@
 	DHO,
 	DDB,
 	DREF,
+	DGPRS,
 	Debug_LastEntry,
 };