ARM: dts: Add MFC memory banks to exynos5420 boards

Add MFC memory banks to Exynos5420 based SMDK and Arndale-octa boards.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --cc arch/arm/boot/dts/exynos5420-arndale-octa.dts
Simple merge

diff --cc arch/arm/boot/dts/exynos5420-smdk5420.dts
Simple merge