[SCSI] zfcp: remove access control tables interface (keep sysfs files)

[SCSI] zfcp: remove access control tables interface (keep sysfs files)

By popular demand, this patch brings back a couple of sysfs attributes
removed by commit 69110dcdd754732cbed91d3cc1980b465ab04b0f
"[SCSI] zfcp: remove access control tables interface".
The content has been irrelevant for years, but the files must be
there forever for whatever user space tools that may rely on them.

Since these files always return a constant value, a new stripped
down show-macro was required. Otherwise build warnings would have
been introduced.

Signed-off-by: Martin Peschke <mpeschke@linux.vnet.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>