merge ktrace-lwp.

Misc cleanup:
- KNF
- WARNSfy
- remove __P()
- remove register declarations
- const'ify some variables
- make some local functions/variables static
- bcopy -> memcpy
- bcmp -> memcmp
- bzero -> memse

Misc cleanup:
- KNF
- WARNSfy
- remove __P()
- remove register declarations
- const'ify some variables
- make some local functions/variables static
- bcopy -> memcpy
- bcmp -> memcmp
- bzero -> memset
- space/TAB fix
etc.

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Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

Complete and total reorganization of the hp300 boot code, modeled
closely after the build process used by NetBSD/alpha's boot code.