libre: uboot4extlinux-sunxi: lower maintenance costs

- We can now do cross builds of u-boot:
  - We can now more easily work on the package as we don't need
    an ARM computer for that anymore.
  - It also enable people already using Parabola on x86 to more
    easily install, test, or repair u-boot for an ARM computer
    as users can simply install it on microSD cards without
    needing to use ARM chroots.
- There is now an install script to install u-boot:
  - It makes things easier for users as it is more similar to
    grub-install than dd commands.
  - It also does many checks at the same time to avoid data loss.
- The commands to split packages are now shared between all
  package_ functions. This lower maintenance.
- How to add a new board has been made more clear.

Comparison with other distributions (for consistency):
- u-boot doesn't have anything to handle the installation and
  update of u-boot binaries if UEFI is not used.
- Debian has an u-boot-install-sunxi script which handles way more
  cases than what I wrote (it even handles GPT and so on and even
  has a manual), but there seems to be no tools to update u-boot.
- Openembedded doesn't seem to have anything special in
  the u-boot recipe in openembedded-core

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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