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[bhnd] Fix release of uninitialized SPROM shadow in chipc detach.

Description

[bhnd] Fix release of uninitialized SPROM shadow in chipc detach.

This was triggering a panic on detach; the SPROM shadow is now
maintained by the bhnd_sprom_chipc driver, and should be removed
from chipc.

Submitted by: Landon Fuller <landonf@landonf.org>
Differential Revision: https://reviews.freebsd.org/D6548