s390/cio: export measurement data for all CMGs

A channel-path's channel-measurement-group value (CMG) determines the
format of associated measurement data and characteristics blocks. Both
blocks are of fixed size and contain a generic and CMG-dependent part.

Currently CIO exports these data blocks via sysfs only for a specific
list of CMGs even though the kernel itself does not interpret
CMG-dependent data.

Change CIO to export measurement data and characteristics for all CMGs.
This enables supporting new CMG data formats in userspace without the
need for kernel changes.
Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

drivers/s390/cio/chsc.c

@@ -1126,10 +1126,6 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp)
 	chp->cmg = scmc_area->cmg;
 	chp->shared = scmc_area->shared;
 	chp->extended = scmc_area->extended;
-	if (chp->cmg != 2 && chp->cmg != 3) {
-		/* No cmg-dependent data. */
-		goto out;
-	}
 	chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
 				  (struct cmg_chars *) &scmc_area->data);
 out: