IB/mlx4: Initialize send queue entry ownership bits

We need to initialize the owner bit of send queue WQEs to hardware
ownership whenever the QP is modified from reset to init, not just
when the QP is first allocated.  This avoids having the hardware
process stale WQEs when the QP is moved to reset but not destroyed and
then modified to init again.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>