add nk_io at24_eeprom driver

hc

2023-02-14 796a7ef0befd21e25c2b9e42f53a6d7a4421941d

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Partial implementation of various ring layouts, useful to tune virtio design.
Uses shared memory heavily.
 
Typical use:
 
# sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring