ARM: dts: imxrt1050: add node label to osc

Let's add node label to osc to be used as clock source for other nodes.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
diff --git a/arch/arm/dts/imxrt1050.dtsi b/arch/arm/dts/imxrt1050.dtsi
index a928100..b7cc3fb 100644
--- a/arch/arm/dts/imxrt1050.dtsi
+++ b/arch/arm/dts/imxrt1050.dtsi
@@ -28,7 +28,7 @@
 	clocks {
 		u-boot,dm-spl;
 
-		osc {
+		osc: osc {
 			u-boot,dm-spl;
 			compatible = "fsl,imx-osc", "fixed-clock";
 			#clock-cells = <0>;