Cleanup (NGAP): remove NR_HandoverPreparationInformation.h from NGAP includes

this is not an NGAP header and does not belong to ngap_msg_includes.h

openair3/NGAP/ngap_gNB_mobility_management.c

@@ -31,6 +31,7 @@
 #include "ngap_gNB_management_procedures.h"
 #include "ngap_gNB_encoder.h"
 #include "ngap_gNB_itti_messaging.h"
+#include "NR_HandoverPreparationInformation.h"
 #include "conversions.h"
 
 /** @brief UE Mobility Management: encode Handover Required

openair3/NGAP/ngap_msg_includes.h

@@ -102,7 +102,6 @@
 #include "NGAP_PDUSessionResourceAdmittedItem.h"
 #include "NGAP_HandoverRequestAcknowledgeTransfer.h"
 #include "NGAP_QosFlowItemWithDataForwarding.h"
-#include "NR_HandoverPreparationInformation.h"
 #include "NGAP_HandoverNotify.h"
 #include "NGAP_DRBsSubjectToStatusTransferItem.h"
 #include "NGAP_DRBStatusUL.h"