P2P: Ignore remain-on-channel callback event if not waiting for one

P2P: Ignore remain-on-channel callback event if not waiting for one

It was possible for the previously requested remain-on-channel for P2P
listen state to get canceled before having received driver event
indicating start of that remain-on-channel operation. In such a case,
the event was able to trigger P2P module to start processing listen
timeout even though there was not supposed to be a following listen
operation anymore. Skip the driver event if we are not waiting for a new
listen state.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>