Constify struct cfattach.

ok visa@ a long time ago, ok patrick@

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, whi

dev/rndvar.h no longer has statistical interfaces (removed during various
conversion steps). it only contains kernel prototypes for 4 interfaces,
all of which legitimately belong in sys/systm.h, which are already included
by all enqueue_randomness() users.

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Hook sxisid(4) up to the nvmem "framework".

ok patrick@

Add sxisid(4), a driver to read the on-chip eFuses written by
Krystian Lewandowski.

ok patrick@