add nk_io at24_eeprom driver

hc

2023-02-14 796a7ef0befd21e25c2b9e42f53a6d7a4421941d

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# Locally computed:
sha256  79b4c54cdbaf02c1a9a691d9948fcb1a77a1591a813e904283a8b614b757e850  fetchmail-6.3.26.tar.xz