tools: zynqmpimage: add partition extracting

Extract partitions from a Xilinx Boot Image using dumpimage.

Add helper for_each_zynqmp_part() to reuse the partition walking code
between the printing and extracting functions.

Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Link: https://lore.kernel.org/r/20240104185258.39465-3-brandon.maier@collins.com


Signed-off-by: Michal Simek <michal.simek@amd.com>