xtensa: ISS: fix section mismatch in iss_net_setup

iss_net_setup is only called from __setup, so it should be marked
__init.
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NChris Zankel <chris@zankel.net>

arch/xtensa/platforms/iss/network.c

@@ -700,7 +700,7 @@ struct iss_net_init {
 
 #define ERR KERN_ERR "iss_net_setup: "
 
-static int iss_net_setup(char *str)
+static int __init iss_net_setup(char *str)
 {
 	struct iss_net_private *device = NULL;
 	struct iss_net_init *new;