HSD #15013345463: arch: arm64: dts: Added the rsu-handle for Uboot to retrieve qspi_boot

Added the rsu-handle in the Linux dts for Uboot to retrieve qspi_boot
node in the dts. This is to fix the symbols removed in the kernel
6.1.20-lts build with the CONFIG_OVERLAY_FS disabled.

Signed-off-by: Kah Jing Lee <kah.jing.lee@intel.com>

Author: kahjingl90

arch/arm64/boot/dts/intel/socfpga_agilex5_socdk.dts

@@ -186,6 +186,7 @@
 			compatible = "fixed-partitions";
 			#address-cells = <1>;
 			#size-cells = <1>;
+			rsu-handle = <&qspi_boot>;
 
 			qspi_boot: partition@0 {
 				label = "u-boot";