ARM: dts: Move common dt data for interrupt combiner controller for exynos4x12

This patch move common dt data of interrupt combiner controller to
exynos4x12.dtsi. Each Exynos4x12 SoC has different number of interrput combiner
as following:
- Exynos4212 : interrput combiner 18(0 ~ 17)
- Exynos4412 : interrput combiner 20(0 ~ 19)

The exynos combiner driver initialize interrupt according to specific number
of interrput combiner.
- samsung,combiner-nr : The number of interrput combiners supported.

Also,
This patch arrange again the dt data according to register address
in exynos4212/exynos4412.dtsi.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>