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

Make all changes to #include statements and build files.
diff --git a/src/hnbap/UERegisterAccept.c b/src/hnbap/UERegisterAccept.c
index 87b15fd..1da47fe 100644
--- a/src/hnbap/UERegisterAccept.c
+++ b/src/hnbap/UERegisterAccept.c
@@ -5,7 +5,7 @@
  * 	`asn1c -gen-PER`
  */
 
-#include <osmocom/osmo-iuh/hnbap/UERegisterAccept.h>
+#include <osmocom/hnbap/UERegisterAccept.h>
 
 static int
 memb_ueRegisterAccept_ies_constraint_1(asn_TYPE_descriptor_t *td, const void *sptr,