sparc: Annotate of_device_id arrays with const or __initdata.

As suggested by Stephen Rothwell.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index 1f1ee25..084dfe9 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -666,7 +666,7 @@
 	return 0;
 }
 
-static struct of_device_id cpwd_match[] = {
+static const struct of_device_id cpwd_match[] = {
 	{
 		.name = "watchdog",
 	},