Replace redundant CU_F1AP/DU_F1AP with F1AP

common/utils/LOG/log.c

common/utils/LOG/log.h

common/utils/T/T_messages.txt

openair2/F1AP/f1ap_cu_interface_management.c

openair2/F1AP/f1ap_cu_rrc_message_transfer.c

openair2/F1AP/f1ap_cu_task.c

openair2/F1AP/f1ap_cu_task.h

openair2/F1AP/f1ap_cu_ue_context_management.c

openair2/F1AP/f1ap_du_interface_management.c

openair2/F1AP/f1ap_du_rrc_message_transfer.c

openair2/F1AP/f1ap_du_task.c

openair2/F1AP/f1ap_du_task.h

openair2/F1AP/f1ap_du_ue_context_management.c

openair2/F1AP/f1ap_encoder.c