p2p: handle disconnection connection event properly

If the last disconnection event is not cleared or read,
2nd group creation will read the wrong one.

Bug: 159683537
Bug: 153760253
Test: atest android.net.wifi.cts.ConcurrencyTest
Change-Id: Ic229d0a5bbbade259bc5f7def2d16e3b11576456
1 file changed