dts: arm: st: f7: add pllsai entry in stm32f7.dtsi

Add description of the pllsai PLL found on the stm32f7 series.

Signed-off-by: Alain Volmat <[email protected]>

Author: Alain Volmat

dts/arm/st/f7/stm32f7.dtsi

@@ -86,6 +86,12 @@
 			compatible = "st,stm32f7-pll-clock";
 			status = "disabled";
 		};
+
+		pllsai: pllsai {
+			compatible = "st,stm32fx-pllsai-clock";
+			#clock-cells = <0>;
+			status = "disabled";
+		};
 	};
 
 	mcos {