ARM: dts: Simplify MCT interrupt map for exynos4 SoCs

There is no need to use two cells for interrupt specifiers inside the
MCT interrupt map, so this patch simplifies the map to use one cell.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>