add ip1811 driver

hc

2023-11-22 9ca5fbcb63a8dcaee0527f96afb91dc4b4bd8fa9

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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