ARM: dts: exynos: Add devicetree file for the Galaxy S2

Add devicetree file for the Exynos4210 based Galaxy S2 (GT-I9100
version).

Signed-off-by: Stenkin Evgeniy <stenkinevgeniy@gmail.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>