P2P: wait on GO negotiation confirm

This commit reverts:
792c887 P2P: Send GO Negotiation Confirm without wait

Some drivers rely on the wait period for sending packets on the
off-channel. If the wait value is small there's a race condition where
the driver ROC might complete before the packet was sent out.

This doesn't impede other drivers, as the wait is cancelled when a
Tx-completion arrives from the remote peer.

Signed-off-by: Arik Nemtsov <arik@wizery.com>