Move radio CMakeLists.txt to subdirectory

- move following radios: AW2S, BladeRF, IRIS, LMSSDR, RFsimulator, USRP
- move following transports: Ethernet, benetel4g, benetel5g
- for each: create independent cmake variable to switch compilation
  on/off, in order: OAI_AW2S, OAI_BLADERF, OAI_IRIS, OAI_LMSSDR,
  OAI_SIMU, OAI_USRP, OAI_ETHERNET, OAI_BENETEL4G, OAI_BENETEL5G
- Remove RF_BOARD variable, allows to compile multiple boards at once
- where applicable: remove USERSPACE/LIB in path, i.e., move files up to
  directories, as all are userspace libraries

Note that with the above, it is now mandatory to enable a radio
implementation before compiling it, e.g., for USRP:

./build_oai -w USRP
cmake .. -DOAI_USRP=ON && ninja oai_usrpdevif

openair2/ENB_APP/NB_IoT_config.c

@@ -39,7 +39,7 @@
 #include "SystemInformationBlockType2.h"
 
 #include "PHY/phy_extern.h"
-#include "radio/ETHERNET/USERSPACE/LIB/ethernet_lib.h"
+#include "radio/ETHERNET/ethernet_lib.h"
 #include "common/config/config_userapi.h"
 #include "RRC_config_tools.h"
 #include "RRC_paramsvalues.h"

openair2/ENB_APP/enb_config.c

@@ -47,7 +47,7 @@
 #include "LAYER2/MAC/mac_proto.h"
 #include "PHY/phy_extern.h"
 #include "PHY/INIT/phy_init.h"
-#include "radio/ETHERNET/USERSPACE/LIB/ethernet_lib.h"
+#include "radio/ETHERNET/ethernet_lib.h"
 #include "nfapi_vnf.h"
 #include "nfapi_pnf.h"
 #include "executables/lte-softmodem.h"

openair2/GNB_APP/gnb_config.c

@@ -51,7 +51,7 @@
 // #include "LAYER2/MAC/extern.h"
 // #include "LAYER2/MAC/proto.h"
 #include "PHY/INIT/nr_phy_init.h"
-#include "radio/ETHERNET/USERSPACE/LIB/ethernet_lib.h"
+#include "radio/ETHERNET/ethernet_lib.h"
 #include "nfapi_vnf.h"
 #include "nfapi_pnf.h"
 #include "nr_pdcp/nr_pdcp_oai_api.h"

openair2/MCE_APP/mce_config.c

@@ -45,7 +45,7 @@
 #include "LAYER2/MAC/mac_proto.h"
 #include "PHY/phy_extern.h"
 #include "PHY/INIT/phy_init.h"
-#include "radio/ETHERNET/USERSPACE/LIB/ethernet_lib.h"
+#include "radio/ETHERNET/ethernet_lib.h"
 #include "nfapi_vnf.h"
 #include "nfapi_pnf.h"
 

openair2/NR_UE_PHY_INTERFACE/NR_IF_Module.c

@@ -45,7 +45,7 @@
 #include "openair2/RRC/NR_UE/rrc_vars.h"
 #include "openair2/GNB_APP/L1_nr_paramdef.h"
 #include "openair2/GNB_APP/gnb_paramdef.h"
-#include "radio/ETHERNET/USERSPACE/LIB/if_defs.h"
+#include "radio/ETHERNET/if_defs.h"
 #include <stdio.h>
 #include "openair2/GNB_APP/MACRLC_nr_paramdef.h"
 

openair2/PHY_INTERFACE/phy_stub_UE.c

@@ -27,7 +27,7 @@
 #include "openair2/PHY_INTERFACE/phy_stub_UE.h"
 #include "openair2/ENB_APP/L1_paramdef.h"
 #include "openair2/ENB_APP/enb_paramdef.h"
-#include "radio/ETHERNET/USERSPACE/LIB/if_defs.h"
+#include "radio/ETHERNET/if_defs.h"
 #include "common/config/config_load_configmodule.h"
 #include "common/config/config_userapi.h"
 #include <arpa/inet.h>