LinuxKPI: use LINUXKPI_DEBUG to determine on witness lock tracing

[bz]

Summary

LinuxKPI by default tells witness to ignore the locks, which is
unhelpful in case of panics like 'panic: sleeping thread holds lnxspin'.
While I have edited the lock initialitzation manually in the past,
make this dependent on both LINUXKPI_DEBUG and WITNESS.
Define an internal _LKPI_MTX_NOWITNESS (and equivalent for other lock
types used) and set them accordingly in kconfig.h, a file automatically
included to all LinuxKPI compiled code (like global.h).
In addition, in the debug case, also define WITNESS_ALL to get file,
line, and lock name as a lock name rather than just, e.g., lnxspin.

Sponsored by: The FreeBSD Foundation
MFC after: 3 days

[bz]

sys/compat/linuxkpi/common/include/linux/kconfig.h

43

Tell witness to not ignore .. probably better phrasing.

57

Excessive blank lines to be removed before commit.

[bz]

I will hold back on this one for a bit until my WITNESS mystery posted on current (and hackers previously) is solved unless someone can assure me turning this on will not immediately kill drm-kmod (drivers).

[bz]

Otherwise I'll make those variables and tunables allowing us to turn them on or off or something more selectively.

[bz]

Anyone care to look at the parent in the stack which adds option LINUXKPI_DEBUG to the build system, etc.?