serial: fix section mismatch vr41xx_siu

Fix section mismatch vr41xx_siu.

WARNING: drivers/built-in.o(.text+0x2ce4c): Section mismatch: reference to .init.text:uart_parse_options (between 'siu_console_setup' and 'siu_request_port')
WARNING: drivers/built-in.o(.text+0x2ce70): Section mismatch: reference to .init.text:uart_set_options (between 'siu_console_setup' and 'siu_request_port')

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/vr41xx_siu.c

@@ -782,7 +782,7 @@ static void siu_console_write(struct console *con, const char *s, unsigned count
 	siu_write(port, UART_IER, ier);
 }
 
-static int siu_console_setup(struct console *con, char *options)
+static int __init siu_console_setup(struct console *con, char *options)
 {
 	struct uart_port *port;
 	int baud = 9600;