fix (RRC): include NR ASN constants in DU SIB builder

Include NR_asn_constant.h in rrc_gNB_du.c so NR_maxCellIntra and NR_maxCellInter
are defined during compilation.
Signed-off-by: Guido Casati <guido.casati@openairinterface.org>

openair2/RRC/NR/rrc_gNB_du.c

@@ -27,6 +27,7 @@
 #include "NR_SIB3.h"
 #include "NR_SIB4.h"
 #include "NR_Q-OffsetRange.h"
+#include "NR_asn_constant.h"
 #include "openair2/RRC/NR/MESSAGES/asn1_msg.h"
 #include "rrc_gNB_mobility.h"
 #include "openair2/F1AP/f1ap_common.h"