backport to 9.0.x: Move the nRF saved word #9168
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Instead of putting it in our uninit section, we need to ensure it is also uninit by the UF2 bootloader. We both leave at least the first 32k of RAM for the soft device, so place our word just before the end of 32k. This is ok because we only use it before the SD is started. Fixes adafruit#9143 and doesn't require a bootloader change.
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Cherry-picked from bcae6ae
From #9160: