ARM: imx: Let SPL configure ECSPI1 clock on Data Modul i.MX8M Plus eDM SBC

The SPL clock code does configure the ECSPI clock frequency, which has
to match the mxc-spi driver configuration for successful SPI NOR boot.
Drop the assigned-clock from DT ecspi1 node on this board to let the
SPL clock code do the configuration and keep it aligned with the driver
expectation.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/dts/imx8mp-data-modul-edm-sbc-u-boot.dtsi b/arch/arm/dts/imx8mp-data-modul-edm-sbc-u-boot.dtsi
index cb6ea35..805b5f5 100644
--- a/arch/arm/dts/imx8mp-data-modul-edm-sbc-u-boot.dtsi
+++ b/arch/arm/dts/imx8mp-data-modul-edm-sbc-u-boot.dtsi
@@ -45,6 +45,9 @@
 };
 
 &ecspi1 {
+	/delete-property/ assigned-clocks;
+	/delete-property/ assigned-clock-rates;
+	/delete-property/ assigned-clock-parents;
 	bootph-pre-ram;
 	flash@0 {
 		bootph-pre-ram;