P2P: Fix the issue in setting optimized listen channel

P2P: Fix the issue in setting optimized listen channel

wpas_p2p_optimize_listen_channel() checks for the state and current ssid
of the interface calling this function. This check prevents the function
from setting the optimized listen channel. Since the listen channel is
stored in global P2P configuration data, do not check the state and
current interface of the caller.

Signed-off-by: Sunil Ravi <sunilravi@google.com>