Re-enable write same support for ipr RAID adapters.
Signed-off-by: NBrian King <brking@linux.vnet.ibm.com>
Reviewed-by: NWen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: NDaniel Kreling <kreling@linux.vnet.ibm.com>
Signed-off-by: NJames Bottomley <JBottomley@Odin.com>