[Armbian build PR] - bsp-cli: allow hooks to cleanly add code to the bsp-cli postinst; fix `helios4` to match

bsp-cli: allow hooks to cleanly add code to the bsp-cli postinst; fix helios4 to match

• bsp-cli: allow hooks to cleanly add code to the bsp-cli postinst; fix helios4 to match
  • bsp-cli: postinst is now generated after the hooks are run
    • hooks are allowed to append to postinst_functions array
    • hooks are not allowed to modify DEBIAN/postinst directly anymore (it won't even be there)
  • rewrite the postinst stuff in helios4's family_tweaks_bsp() to use new way
  • introduce add_file_from_stdin_to_bsp_destination(), a helper for easy heredoc-based adding of files to bsp-cli
    • First and only argument is the destination path, relative to the root of the package -- do NOT include $destination -- it is already included.
    • Containing directory, if any, is created automatically (no more "mkdir -p x; cp y x/z")
    • The full path (including $destination) is set in $file_added_to_bsp_destination, declare in outer scope to get it if needed.

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