This patch adds definitions to support for different operating modes
for LSI rdac storage.  Currently, rdac support 3 operation modes.

1. RDAC mode(legacy)
2. AVT mode
3. IOSHIP mode

These definitions are used while activating the path(rdac_activate).
Signed-off-by: NBabu Moger <babu.moger@lsi.com>
Reviewed-by: NYanling Qi <yanling.qi@lsi.com>
Reviewed-by: NSudhir Dachepalli <Sudhir.Dachepalli@lis.com>
Reviewed-by: NSomasundaram Krishnasamy <Somasundaram.Krishnasamy@lsi.com>
Reviewed-by: NBob Stankey <Robert.Stankey@lsi.com>
Reviewed-by: NVijay Chauhan <Vijay.Chauhan@lsi.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>