Remove vfio_device_t label from /dev/sclp[0-9]* and /dev/vmcp[0-9]*

[eaibmz]

/dev/sclp[0-9]* and /dev/vmcp[0-9]* are s390x-specific character devices which are unrelated to VFIO. Therefore, change the label back to device_t.

Fixes: 61939da ("Add support for /dev/vmcp and /dev/sclp")

Related issue: #2864

[zpytela]

@WOnder93 What do you think would be appropriate label for these device files? The current version was added in 61939da and b1f7f8e (plus a fix in 2ce8aee).

[WOnder93]

/dev/sclp (I believe it doesn't have numbered suffixes, just a single device) is a simple ioctl-only device that supports just one ioctl. It's apparently used as a control device for the IBM SCLP terminal. Seems to be very niche and could probably have its own label.

/dev/vmcp (I think this one isn't numbered either) is for communicating with the "z/VM control program" (i.e. for z/VM virtual machines to communicate with the hypervisor). I'd say it's likewise pretty niche and could have its own label.

/dev/clp is also s390x-specific, but unrelated to /dev/sclp. It appears to be some control device for PCI bus on s390x machines. Likewise should probably have its own label.

Or they could all be misc_device_t (in the kernel they are all registered as a "misc" device), but that seems to be unused currently.