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/sbus/char/envctrl.c b/drivers/sbus/char/envctrl.c
index ea8c35cb..58e583b 100644
--- a/drivers/sbus/char/envctrl.c
+++ b/drivers/sbus/char/envctrl.c
@@ -1120,7 +1120,7 @@
 	return 0;
 }
 
-static struct of_device_id envctrl_match[] = {
+static const struct of_device_id envctrl_match[] = {
 	{
 		.name = "i2c",
 		.compatible = "i2cpcf,8584",