ARM: dts: add Exynos audio subsystem clock controller node

Audio subsystem introduced in s5pv210 and exynos platforms
which has a internal clock controller. This patch adds a node
for the same on exynos5250.
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250.dtsi

@@ -72,6 +72,12 @@ clock: clock-controller@0x10010000 {
 		#clock-cells = <1>;
 	};
 
+	clock_audss: audss-clock-controller@3810000 {
+		compatible = "samsung,exynos5250-audss-clock";
+		reg = <0x03810000 0x0C>;
+		#clock-cells = <1>;
+	};
+
 	gic:interrupt-controller@10481000 {
 		compatible = "arm,cortex-a15-gic", "arm,cortex-a9-gic";
 		#interrupt-cells = <3>;