[faiproject/fai] a2c010: use external function set_bootstick

[Mrfai]

  Branch: refs/heads/master
  Home:   https://github.com/faiproject/fai
  Commit: a2c01069f47e7412a8fe69d72ad817d13c74a9e6
      https://github.com/faiproject/fai/commit/a2c01069f47e7412a8fe69d72ad817d13c74a9e6
  Author: Thomas Lange <lange at debian.org>
  Date:   2023-12-14 (Thu, 14 Dec 2023)

  Changed paths:
    M lib/fai-mount-disk

  Log Message:
  -----------
  use external function set_bootstick


  Commit: b27f265b7e162b15535bb211bcbe0fdd81dffb83
      https://github.com/faiproject/fai/commit/b27f265b7e162b15535bb211bcbe0fdd81dffb83
  Author: Thomas Lange <lange at debian.org>
  Date:   2023-12-14 (Thu, 14 Dec 2023)

  Changed paths:
    M bin/mk-data-partition

  Log Message:
  -----------
  improve help


Compare: https://github.com/faiproject/fai/compare/7d0ef11b9ba1...b27f265b7e16