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nv_host_desc and nv_host are used to discern different generations of
nv controllers.  Kill those.  New EH/hotplug implementation will use
standard port_info/ata_port_operations for that.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>