Add support for READ DEFECT DATA (10/12) commands.

SPC-4 r2 allows to return empty defect list if the list is not supported.
We don't reallu support defect data lists, but this suppresses some errors.

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273038 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f