kgdboc: Remove useless #ifdef CONFIG_KGDB_SERIAL_CONSOLE in kgdboc

This file is only ever compiled if that config is on since the
Makefile says:

  obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o

Let's get rid of the useless #ifdef.
Reported-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200507130644.v4.7.Icb528f03d0026d957e60f537aa711ada6fd219dc@changeidSigned-off-by: Daniel Thompson <daniel.thompson@linaro.org>

drivers/tty/serial/kgdboc.c

@@ -380,7 +380,6 @@ static struct kgdb_io kgdboc_io_ops = {
 	.post_exception		= kgdboc_post_exp_handler,
 };
 
-#ifdef CONFIG_KGDB_SERIAL_CONSOLE
 static int kgdboc_option_setup(char *opt)
 {
 	if (!opt) {
@@ -409,7 +408,6 @@ static int __init kgdboc_early_init(char *opt)
 }
 
 early_param("ekgdboc", kgdboc_early_init);
-#endif /* CONFIG_KGDB_SERIAL_CONSOLE */
 
 module_init(init_kgdboc);
 module_exit(exit_kgdboc);