Provide improved mailbox communication, between PF and VF,
which is defined as API version 1.5.
Signed-off-by: NRadoslaw Tyl <radoslawx.tyl@intel.com>
Tested-by: NTony Brelinski <tony.brelinski@intel.com>
Signed-off-by: NTony Nguyen <anthony.l.nguyen@intel.com>