merge ktrace-lwp.

Add commented about keyboard IDs. No functional change.

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

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

Refactor kbd and mouse drivers so that they can use different middle
layers. Common middle layer shared by kbd_zs and sunkbd is moved into
the new file. Move shared config directives to files.sun a

Refactor kbd and mouse drivers so that they can use different middle
layers. Common middle layer shared by kbd_zs and sunkbd is moved into
the new file. Move shared config directives to files.sun and adjust
ports' files.* accordingly.

Need this to support console/Xsun on Mr.Coffee JavaStation.

Tested on sparc, sparc64 (by martin) and sun3 (by jdc).

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Added Sun common kbd_reg.h, kbio.h, and vuid_event.h files.