[SCSI] ipr: Expose debug and fastfail parameters

Expose the debug and fastfail parameters to /sys/module/ipr/parameters such
that they can be enabled/disabled at run time.

Signed-off-by: Wayne Boyer <wayneb@linux.vnet.ibm.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>