conf/board: fix the legacy build

Move the legacy builds over to the new naming scheme
Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>

conf/board

@@ -72,8 +72,8 @@ case ${pureos_board} in
     kernel_arch=arm64
     case "${build_type}" in
       legacy)
-        kernel_url="${kernel_base}/kernel_devkit_linux-next_imx8-legacy-devkit/${archive_path}"
-        uboot_url="${uboot_base}/uboot_devkit_mainline_atf_build/${archive_path}"
+        kernel_url="${kernel_base}/kernel_linux-next_imx8-legacy-librem5/${archive_path}"
+        uboot_url="${uboot_base}/uboot_devkit_build/${archive_path}"
         ;;
       next)
         kernel_url="${kernel_base}/kernel_linux-next_imx8-linux-next-librem5/${archive_path}"