net/mlx4_core: Add basic elements for QCN

Add device capability, firmware command opcode and etc prior elements
needed for QCN suppprt. Disable SRIOV VF view/access for QCN is disabled.

While here, remove a redundant offset definition into the
QUERY_DEV_CAP mailbox.

Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index e4ebff7..1cc5482 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -203,7 +203,8 @@
 	MLX4_DEV_CAP_FLAG2_80_VFS		= 1LL <<  18,
 	MLX4_DEV_CAP_FLAG2_FS_A0		= 1LL <<  19,
 	MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT = 1LL << 20,
-	MLX4_DEV_CAP_FLAG2_PORT_REMAP		= 1LL <<  21
+	MLX4_DEV_CAP_FLAG2_PORT_REMAP		= 1LL <<  21,
+	MLX4_DEV_CAP_FLAG2_QCN			= 1LL <<  22,
 };
 
 enum {