sparc: leon: grpci2: constify of_device_id

of_device_id are not supposed to change at runtime. All functions
working with of_device_id provided by <linux/of.h> work with const
of_device_ids. So mark the const and __initconst.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/leon_pci_grpci2.c

@@ -886,7 +886,7 @@ err1:
 	return err;
 }
 
-static struct of_device_id grpci2_of_match[] = {
+static const struct of_device_id grpci2_of_match[] __initconst = {
 	{
 	 .name = "GAISLER_GRPCI2",
 	 },