serial: fix 8250 early console setup

the early setup function serial8250_console_early_setup() can be called
from non __init code (eg. hotpluggable serial ports like serial_cs) so
remove the __init from the call chain to avoid crashes.

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Cc: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 2f5a5ac..3013130 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2514,7 +2514,7 @@
 	return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
-static int __init serial8250_console_early_setup(void)
+static int serial8250_console_early_setup(void)
 {
 	return serial8250_find_port_for_earlycon();
 }