hw.bus.info: rework handler
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Authored by kaktus on Jun 17 2020, 2:14 PM.

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rS362343: hw.bus.info: rework handler

Summary

hw.bus.info was added in rS68522 as a node, but there was never anything connected "behind" it. Its only purpose is to return a struct u_businfo. The only in-base consumer is devinfo(3)/devinfo(8).
Rewrite the handler as SYSCTL_PROC and mark it as MPSAFE and read-only as there never was a writable path.