imx6ulz: synchronise device tree with linux

Synchronise device tree with linux v6.0-rc1.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/arch/arm/dts/imx6ulz.dtsi b/arch/arm/dts/imx6ulz.dtsi
index aeb2ddc..0b5f1a7 100644
--- a/arch/arm/dts/imx6ulz.dtsi
+++ b/arch/arm/dts/imx6ulz.dtsi
@@ -16,7 +16,6 @@
 		/delete-property/ serial7;
 		/delete-property/ spi2;
 		/delete-property/ spi3;
-		/delete-property/ spi4;
 	};
 };