fdttools: add fdt utility tools

[leo11261]

Summary

add fdt utility tools, work with apache/nuttx#10121

Impact

tools for fdt

Testing

internal testing

[btashton]

With the fdt procfs support in you should be able to demonstrate dumping that from a qemu build. I don't think "internal testing" is sufficient evidence that this works. It's fine that there is not an in tree config yet.

[xiaoxiang781216]

With the fdt procfs support in you should be able to demonstrate dumping that from a qemu build. I don't think "internal testing" is sufficient evidence that this works. It's fine that there is not an in tree config yet.

yes, the "internal testing" mean we test this tool with arm/riscv qemu.