ARM: dts: add mipi_phy device node to exynos3250.dtsi

This patch adds mipi_phy device node to reset, disable and enable
DSIM and CSIS PHY.
Signed-off-by: NInki Dae <inki.dae@samsung.com>
Reviewed-by: NAndrzej Hajda <a.hajda@samsung.com>

arch/arm/boot/dts/exynos3250.dtsi

@@ -132,6 +132,12 @@
 			reg = <0x10020000 0x4000>;
 		};
 
+		mipi_phy: video-phy@10020710 {
+			compatible = "samsung,s5pv210-mipi-video-phy";
+			reg = <0x10020710 8>;
+			#phy-cells = <1>;
+		};
+
 		pd_cam: cam-power-domain@10023C00 {
 			compatible = "samsung,exynos4210-pd";
 			reg = <0x10023C00 0x20>;