P2P: Skip event notification on PD Response in join-group case

P2P: Skip event notification on PD Response in join-group case

Provision Discovery is used as a notification to the GO in the case we
are about join a running group. In such case, there is not much point in
indicating the provision discovery response events to external programs
especially when the PIN-to-be-displayed was different from the one
returned for the p2p_connect command. Skip this confusing event
completely for join-a-running-group case.

Signed-hostap: Jouni Malinen <j@w1.fi>