arm: dts: imx8mp: Delete default clocks for clock controller node

Since SPL has initialized clocks for bus and core. We don't need to
set the default clocks for clock controller node.

Signed-off-by: Ye Li <ye.li@nxp.com>
Tested-by: Teresa Remmet <t.remmet@phytec.de>
Tested-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Acked-by: Peng Fan <peng.fan@nxp.com>

arch/arm/dts/imx8mp-u-boot.dtsi

@@ -18,6 +18,9 @@
 &clk {
 	u-boot,dm-spl;
 	u-boot,dm-pre-reloc;
+	/delete-property/ assigned-clocks;
+	/delete-property/ assigned-clock-parents;
+	/delete-property/ assigned-clock-rates;
 };
 
 &osc_32k {