Properly setup the size of the async event queue. This fixes a bug where async events
were not getting processed by the driver.

Setup target_id field in the driver's target struct so that target sysfs attributes
work for multiple targets.
Signed-off-by: NBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>