Add real-time scheduling to osmotv and make it default for all base stations

This is required to drastically reduce the latency of the thread execution.

src/libmobile/main_mobile.c

@@ -68,7 +68,7 @@ const char *mncc_name = "";
 static int send_patterns = 1;
 static int release_on_disconnect = 1;
 int loopback = 0;
-int rt_prio = 0;
+int rt_prio = 1;
 const char *write_tx_wave = NULL;
 const char *write_rx_wave = NULL;
 const char *read_tx_wave = NULL;