ARM: STi: DT: Add support for stih418 A9 pll

Add support for new PLL-type for stih418 A9-PLL.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih418-clock.dtsi

@@ -44,7 +44,7 @@ clockgen-a9@92b0000 {
 
 			clockgen_a9_pll: clockgen-a9-pll {
 				#clock-cells = <1>;
-				compatible = "st,stih407-plls-c32-a9", "st,clkgen-plls-c32";
+				compatible = "st,stih418-plls-c28-a9", "st,clkgen-plls-c32";
 
 				clocks = <&clk_sysin>;