PR #32894: protection fault trap in tmx86_get_longrun_mode

Use rdmsr_safe in tmx86_init_longrun to verify that the MSRs are present.

Add back the CPU_TMLR_* definitions for binary sysctl compatibility
with NetBSD pre-2.0, and use them in the longrun driver again.

Requested by cube@.

- Fixup the machdep.tm_longrun_* sysctl nodes creation.
- The CTL_TMLR_ static definitions for CTL_MACHDEP are not needed anymore.

Split off the Transmeta Crusoe Longrun code into its own file, that
way identcpu.c and machdep.c are not cluttered with foreign code.

The driver is built by default as before, but the sysctl subtree

Split off the Transmeta Crusoe Longrun code into its own file, that
way identcpu.c and machdep.c are not cluttered with foreign code.

The driver is built by default as before, but the sysctl subtree will
only be created if longrun is detected and not always as the old code
did. This matches what the FreeBSD code does.

Ok by christos@.

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