P2P: Try fast associate if p2p GO is found in external scan

Before supplicant issues a scan to driver, check if p2p GO
was found in external scan. If yes, try to do a fast associate.

Bug:187543099
Test: Manual-File transfer using Nearby APP and check the connection
latency.

Change-Id: Idf91d51c08023c4b7a09484cfcce1d271f032589
3 files changed