Move out sgsn to its own subdir

Change-Id: I16fccc0eadf588599b9e5578d0f4dbaf9df81737
diff --git a/tests/xid/Makefile.am b/tests/xid/Makefile.am
index 92876ec..6f058f5 100644
--- a/tests/xid/Makefile.am
+++ b/tests/xid/Makefile.am
@@ -24,7 +24,7 @@
 	$(NULL)
 
 xid_test_LDADD = \
-	$(top_builddir)/src/gprs/gprs_llc_xid.o \
+	$(top_builddir)/src/sgsn/gprs_llc_xid.o \
 	$(LIBOSMOABIS_LIBS) \
 	$(LIBOSMOCORE_LIBS) \
 	$(LIBOSMOGSM_LIBS) \