Fixing U-Boot & Kernel dts imx8mp-astrial: aligned clock properties in u-boot dt with kernel dt

to avoid error "clk: failed to reparent uart1 to sys_pll1_80m: -16"

Author: maidnl

meta-arduino-bsp/recipes-bsp/u-boot/u-boot-imx/imx8mp-astrial/imx8mp-astrial.dts

@@ -356,6 +356,8 @@
 	pinctrl-0 = <&pinctrl_uart1>;
 	/delete-property/ dmas;
 	/delete-property/ dmas-names;
+	assigned-clocks = <&clk IMX8MP_CLK_UART1>;
+	assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_80M>;
 	status = "okay";
 };