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-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c
index 1457af1..5626b91 100644
--- a/arch/arm/mach-mvebu/cpu.c
+++ b/arch/arm/mach-mvebu/cpu.c
@@ -20,7 +20,7 @@
 #define DDR_BASE_CS_OFF(n)	(0x0000 + ((n) << 3))
 #define DDR_SIZE_CS_OFF(n)	(0x0004 + ((n) << 3))
 
-static struct mbus_win windows[] = {
+static const struct mbus_win windows[] = {
 	/* SPI */
 	{ MBUS_SPI_BASE, MBUS_SPI_SIZE,
 	  CPU_TARGET_DEVICEBUS_BOOTROM_SPI, CPU_ATTR_SPIFLASH },