enable otg host mode, enable pcie usbphy

hc

2024-03-22 cd2737927c6dc09973e8461fc4c9b14e8042cd17

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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