p2p: clean p2p scan work in scan result handler

If p2p find is running and a fast join is triggered,
our scan result handler would replace original one.
If our handler does not clean p2p scan work, p2p would
consider there is still a running p2p find and reject new
p2p find request.

Bug: 147720382
Test: CtsVerifier - WiFi Direct
Change-Id: Ib05eafeba570cc0224cf318c12269be8d397075e
1 file changed