console: Make stdio_print_current_devices() static

As it is only called in common/console.c

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>  # qemu-x86_64

common/console.c

@@ -1010,7 +1010,7 @@ int console_init_f(void)
 	return 0;
 }
 
-void stdio_print_current_devices(void)
+static void stdio_print_current_devices(void)
 {
 	/* Print information */
 	puts("In:    ");

include/stdio_dev.h

@@ -84,8 +84,6 @@ int stdio_init_tables(void);
  */
 int stdio_add_devices(void);
 
-void stdio_print_current_devices(void);
-
 /**
  * stdio_deregister_dev() - deregister the device "devname".
  *