ARM: dts: disable MDMA1 node for exynos5420

ARM: dts: disable MDMA1 node for exynos5420

commit e6015c1f8a9032c2aecb78d23edf49582563bd47 upstream.

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>
Signed-off-by: Tushar Behera <tushar.b@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>