ARM: dts: Add SROM device node for exynos4

Add device node of SROM controller for exynos4.

CC: Rob Herring <robh+dt@kernel.org>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
[k.kozlowski: fixed size of mapped SROMC memory region]
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

arch/arm/boot/dts/exynos4.dtsi

@@ -76,6 +76,11 @@ chipid@10000000 {
 		reg = <0x10000000 0x100>;
 	};
 
+	sromc@12570000 {
+		compatible = "samsung,exynos-srom";
+		reg = <0x12570000 0x14>;
+	};
+
 	mipi_phy: video-phy@10020710 {
 		compatible = "samsung,s5pv210-mipi-video-phy";
 		#phy-cells = <1>;