[SCSI] ipr: fix synchronous request flags for better performance

In testing it was noticed that Extended Delay after Reset flag was being set
for gscsi and volume set devices.  This had a negative effect on performance
for volume sets.  The fix is to only set the flag for gscsi devices.

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@suse.de>