Reading the wl1251 data on each boot can be useful when using the same SD card
on different devices, allowing each to fetch its correct calibration data.
Additionally, this opens up the possibility to simplify the packaging (in
follow-up commit)
This is a device-specific package. The only device that depends on
this, device-nokia-n900, is in community, so let's move it there too.
[ci:skip-build]: already built successfully in CI