This change places MDMA1 in disabled node for Exynos5420. If MDMA1 region is configured with secure mode, it makes the boot failure with the following on smdk5420 board. ("Unhandled fault: imprecise external abort (0x1406) at 0x00000000") Thus, arndale-octa board don't need to do the same thing anymore. Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com> Tested-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>