Header cleaups and unitary simulators build fixes

CMakeLists.txt

openair1/SIMULATION/NR_PHY/dlschsim.c

openair1/SIMULATION/NR_PHY/dlsim.c

openair1/SIMULATION/NR_PHY/nr_dummy_functions.c

openair1/SIMULATION/NR_PHY/nr_gtp_stub.c

openair1/SIMULATION/NR_PHY/pbchsim.c

openair1/SIMULATION/NR_PHY/prachsim.c

openair1/SIMULATION/NR_PHY/pucchsim.c

openair1/SIMULATION/NR_PHY/ulschsim.c

openair1/SIMULATION/NR_PHY/ulsim.c

openair2/COMMON/e1ap_messages_types.h

openair2/E1AP/CMakeLists.txt

openair2/E1AP/e1ap.c

openair2/E1AP/e1ap.h

openair2/E1AP/e1ap_api.c

openair2/E1AP/e1ap_api.h

openair2/E1AP/e1ap_asnc.h

openair2/E1AP/e1ap_common.c

openair2/E1AP/e1ap_common.h

openair2/LAYER2/NR_MAC_gNB/main.c