boot: Split pxe label_run_boot() into two parts

This function is quite long. Split out the FDT processing into its own
function.

Add a function comment for the new label_process_fdt() function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
1 file changed