[SCSI] iscsi: add module alias

Since iscsi transport can be built as a module and uses netlink socket
to communicate. The module should have an alias to autoload when socket
of NETLINK_ISCSI type is requested.

Signed-off-by: Stephen Hemminger <[e-mail]>
Acked-by: Mike Christie <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/scsi_transport_iscsi.c

···
 MODULE_DESCRIPTION("iSCSI Transport Interface");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
+MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);