imx: dts: move common changes to imx8mq-u-boot.dtsi

Move some common changes to imx8mq-u-boot.dtsi, so others could reuse it

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/arch/arm/dts/imx8mq-u-boot.dtsi b/arch/arm/dts/imx8mq-u-boot.dtsi
index 1dc060c..912a3d4 100644
--- a/arch/arm/dts/imx8mq-u-boot.dtsi
+++ b/arch/arm/dts/imx8mq-u-boot.dtsi
@@ -10,6 +10,30 @@
 
 };
 
+&{/soc@0} {
+	u-boot,dm-spl;
+};
+
+&{/soc@0/bus@30000000} {
+	u-boot,dm-spl;
+};
+
+&{/soc@0/bus@30400000} {
+	u-boot,dm-spl;
+};
+
+&{/soc@0/bus@30800000} {
+	u-boot,dm-spl;
+};
+
+&{/soc@0/bus@32c00000} {
+	u-boot,dm-spl;
+};
+
+&iomuxc {
+	u-boot,dm-spl;
+};
+
 &binman {
 	u-boot-spl-ddr {
 		align = <4>;