Remove FSBL (now using U-Boot SPL)

sw/21_build_bootimg.sh

@@ -1,24 +0,0 @@
-#!/bin/bash
-
-set -e
-
-. script_env
-
-mkdir -p boot_img
-
-cp fsbl/fsbl.elf "$BOOTIMG_DIR"
-cp "$UBOOT_DIR/u-boot.elf" "$BOOTIMG_DIR"
-
-rm -f "$BOOTIMG_DIR/boot.bin"
-
-cat >"$BOOTIMG_DIR/boot.bif" <<EOF
-the_ROM_image:
-{
-    [bootloader]fsbl.elf
-    u-boot.elf
-}
-EOF
-
-source /opt/Xilinx/Vivado/2020.2/settings64.sh
-( cd "$BOOTIMG_DIR" ; bootgen -arch zynq -image boot.bif -o boot.bin )
-