Add a new 'fdt reserved' subcommand that displays all reserved memory
regions defined in the device tree's /reserved-memory node. This command
provides a formatted table showing the ID, name, start address, and size
of each reserved memory region.
Avoid a conflict with the existing 'fdt resize' command. Update the docs
and add a test.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>