dts: arm: st: add pllsai1 node into stm32l4.dtsi

Add a disabled node describing the PLLSAI1 pll within the stm32l4.

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

Author: Alain Volmat

dts/arm/st/l4/stm32l4.dtsi

@@ -104,6 +104,12 @@
 			compatible = "st,stm32l4-pll-clock";
 			status = "disabled";
 		};
+
+		pllsai1: pllsai1 {
+			#clock-cells = <0>;
+			compatible = "st,stm32l4-pllsai-clock";
+			status = "disabled";
+		};
 	};
 
 	mcos {