qedr: post_send/recv according to QP state

Enable posting to SQ only in RTS, ERR and SQD QP state.
Enable posting to RQ in ERR QP state.

Signed-off-by: Ram Amrani <Ram.Amrani@cavium.com>
Reviewed-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>