Remove osmo-iuh subdir level from include/ (2/2)

Make all changes to #include statements and build files.
diff --git a/src/hnbap/S-RNTIPrefix.c b/src/hnbap/S-RNTIPrefix.c
index 042ce57..1601eb4 100644
--- a/src/hnbap/S-RNTIPrefix.c
+++ b/src/hnbap/S-RNTIPrefix.c
@@ -5,7 +5,7 @@
  * 	`asn1c -gen-PER`
  */
 
-#include <osmocom/osmo-iuh/hnbap/S-RNTIPrefix.h>
+#include <osmocom/hnbap/S-RNTIPrefix.h>
 
 int
 S_RNTIPrefix_constraint(asn_TYPE_descriptor_t *td, const void *sptr,