Allow Python packages to be dropped

When building in a portage chroot, we do not have the environment needed
to build pylibfdt. It is instead build as a separate package.

Provide a build option to tell U-Boot to skip this part of the build. We
still need it to use binman, etc. but don't need it to build its
dependencies.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Mike Frysinger <[email protected]>
[s/build bytes/builds bytes in tools.rst]
Signed-off-by: Bin Meng <[email protected]>

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