Issue416 nfapicleanup
make nfapi_mode static to nfapi.c and creates functions to manage it, with meaningful enum type. Also remove l1sim global variable and process this option as the other softmodem options (noS1, rf simu, basic simu...)
make nfapi_mode static to nfapi.c and creates functions to manage it, with meaningful enum type. Also remove l1sim global variable and process this option as the other softmodem options (noS1, rf simu, basic simu...)