don't include hnbgw.h from ranap header files

To use libosmo-ranap from outside of this repository, we need to
eliminated all dependencies to local header files
diff --git a/src/tests/dummy_cn_sua.c b/src/tests/dummy_cn_sua.c
index de850a7..4760b7b 100644
--- a/src/tests/dummy_cn_sua.c
+++ b/src/tests/dummy_cn_sua.c
@@ -307,6 +307,7 @@
 	int rc;
 
 	osmo_sua_set_log_area(DSUA);
+	ranap_set_log_area(DRANAP);
 
 	test_common_init();