nshlib: Move BOARDIOC_FINALINIT into nsh_initscript

1.Avoid the code duplication
2.Call BOARDIOC_FINALINIT onnce and only once
3.Ensure BOARDIOC_FINALINIT get called in all case

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

nshlib/nsh_usbconsole.c

@@ -325,12 +325,6 @@ int nsh_consolemain(int argc, char *argv[])
   netinit_bringup();
 #endif
 
-#if defined(CONFIG_NSH_ARCHINIT) && defined(CONFIG_BOARDCTL_FINALINIT)
-  /* Perform architecture-specific final-initialization (if configured) */
-
-  boardctl(BOARDIOC_FINALINIT, 0);
-#endif
-
   /* Now loop, executing creating a session for each USB connection */
 
   for (;;)