ARM: dts: STiH407: Enable synchronous clock mode for video clocks

This patch enables the synchronous clock mode for video clocks
on STiH407 board.
Signed-off-by: Olivier Bideau <olivier.bideau@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Acked-by: Peter Griffin <peter.griffin@linaro.org>

arch/arm/boot/dts/stih407-clock.dtsi

@@ -256,7 +256,7 @@ clockgen-d2@x9106000 {
 
 			clk_s_d2_flexgen: clk-s-d2-flexgen {
 				#clock-cells = <1>;
-				compatible = "st,flexgen";
+				compatible = "st,flexgen-video", "st,flexgen";
 
 				clocks = <&clk_s_d2_quadfs 0>,
 					 <&clk_s_d2_quadfs 1>,