printk: Export match_devname_and_update_preferred_console()

When building serial_base as a module, modpost fails with the following
error message:

  ERROR: modpost: "match_devname_and_update_preferred_console"
  [drivers/tty/serial/serial_base.ko] undefined!

Export the symbol to allow using it from modules.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: 12c91ce ("serial: core: Add serial_base_match_and_update_preferred_console()")
Signed-off-by: Yu Liao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Petr Mladek <[email protected]>

Author: yuliao0214

kernel/printk/printk.c

@@ -2620,6 +2620,7 @@ int match_devname_and_update_preferred_console(const char *devname,
 
 	return -ENOENT;
 }
+EXPORT_SYMBOL_GPL(match_devname_and_update_preferred_console);
 
 bool console_suspend_enabled = true;
 EXPORT_SYMBOL(console_suspend_enabled);