arm: mvebu: Mark constant data with const keyword

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/arch/arm/mach-kirkwood/cpu.c b/arch/arm/mach-kirkwood/cpu.c
index 80f893a..df3e8f1 100644
--- a/arch/arm/mach-kirkwood/cpu.c
+++ b/arch/arm/mach-kirkwood/cpu.c
@@ -52,7 +52,7 @@
 	return (0x0000ffff & j);
 }
 
-static struct mbus_win windows[] = {
+static const struct mbus_win windows[] = {
 	/* Window 0: PCIE MEM address space */
 	{ KW_DEFADR_PCI_MEM, KW_DEFADR_PCI_MEM_SIZE,
 	  KWCPU_TARGET_PCIE, KWCPU_ATTR_PCIE_MEM },