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msm-fb-refresher: use initfs hook

* postmarketOS Bot requested to merge feature/msm-refresher-initfs-hook into master

Created by: ollieparanoid

The msm-fb-refresher updates the screen for msm based devices. It is not needed for all devices, so we had some extra code in the initramfs, that would only add it when the deviceinfo_msm_refresher variable was set. However, we are able now to add files to initramfs hooks, so this hack can be removed and simplify everything.

Changes:

  • Remove deviceinfo_msm_refresher from all deviceinfos
  • Add sanity check for it
  • Move all deviceinfo sanity checks to an extra function
  • postmarketos-mkinitfs: remove code for msm refresher
  • msm-fb-refresher: add initramfs hook

Testing

I have tested, that pmbootstrap initfs ls shows the same files before and after the change. But this should be tested on a real device that uses the msm-fb-refresher (I don't have one) before we merge it.

Closes #1396 (closed).

[x] Merge on GitHub (see https://postmarketos.org/merge)

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