Networking: Move where the local loopback device is initialized from board_app_intiialize() to up_intiialize() so that it will happen automatically

arch/x86/src/common/up_initialize.c

@@ -44,6 +44,7 @@
 #include <nuttx/arch.h>
 #include <nuttx/board.h>
 #include <nuttx/fs/fs.h>
+#include <nuttx/net/loopback.h>
 #include <nuttx/syslog/ramlog.h>
 #include <nuttx/syslog/syslog_console.h>
 
@@ -194,6 +195,12 @@ void up_initialize(void)
   up_netinitialize();
 #endif
 
+#ifdef CONFIG_NETDEV_LOOPBACK
+  /* Initialize the local loopback device */
+
+  (void)localhost_initialize();
+#endif
+
   /* Initialize USB -- device and/or host */
 
   up_usbinitialize();