isci: Initialize proc_name field in scsi_host_template

The proc_name field in struct scsi_host_template is exported through sysfs and
allows userspace tools to identify the driver behind a particular SCSI host
controller.

Initialize this field so that userspace tools can easily identify isci host
controllers through sysfs.

Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>