bsp: k230: enable FASTBOOT

FIXME: seems when RT_FASTBOOT is enabled, rt_printf should not be
called.

Search "RT_FASTBOOT", you will see many similar code in drivers.
This seems a individual feature need to be extracted and submit
together.

Signed-off-by: Wang Chen <[email protected]>

Author: unicornx

bsp/k230/applications/mnt.c

@@ -50,7 +50,9 @@ int mnt_init(void)
     }
 #endif
 
+#ifndef RT_FASTBOOT
     rt_kprintf("file system initialization done!\n");
+#endif
 
     return 0;
 }