Minor improvement in debugging

[Warner Losh]

While writing the NVMe CAM attachment, I noticed that the xpt_action()
routine’s logging would be a lot more useful if we logged the function
code. In addition, it is useful to log calls to the SIM inside of
xpt_action_default(). Some sims have debugs, others don’t.

This review fixes that. https://reviews.freebsd.org/D4382

Warner

P.S. I’ll be sending out a bunch of review pointers to this list.
If there’s a more-preferred way to do this, please let me know.

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