MFC r256533:
Unhide "Serial Number" lines from bootverbose.  That information may
be useful for system administration to have in hard copy (in logs) if
one of several devices suddenly dies.

Approved by:	re (hrs)
MFC r256552:
Unify periph invalidation and destruction reporting.
Print message containing device model and serial number on invalidation.

Approved by:	re (hrs)