STA+STA WifiLastResortWatchdog interactions

Fix WifiLastResortWatchdog to work correctly with
STA+STA e.g. fix incorrect assumption about only
being 1 STA.

Bug: 181693252
Test: atest FrameworksWifiTests
Change-Id: I4007f6e619287b10c7bf92367c527d64f8055101
4 files changed