hw/arm/exynos4: Use the IEC binary prefix definitions

It eases code review, unit is explicit.
Signed-off-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Message-id: 20190520214342.13709-3-philmd@redhat.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/exynos4_boards.c

@@ -22,6 +22,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/units.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "qemu-common.h"
@@ -60,8 +61,8 @@ static int exynos4_board_smp_bootreg_addr[EXYNOS4_NUM_OF_BOARDS] = {
 };
 
 static unsigned long exynos4_board_ram_size[EXYNOS4_NUM_OF_BOARDS] = {
-    [EXYNOS4_BOARD_NURI]     = 0x40000000,
-    [EXYNOS4_BOARD_SMDKC210] = 0x40000000,
+    [EXYNOS4_BOARD_NURI]     = 1 * GiB,
+    [EXYNOS4_BOARD_SMDKC210] = 1 * GiB,
 };
 
 static struct arm_boot_info exynos4_board_binfo = {