Fix CTS testWifiUsabilityStatsEntry failure

WifiMetrics.convertLinkStats passes arguments to
WifiUsabilityStatsEntry.LinkStats in wrong order and causes CTS test
testWifiUsabilityStatsEntry failure.

Also update unit test case for Wifi usability stats.

Bug: 292189116
Test: run cts -m CtsWifiTestCases
atest com.android.server.wifi.WifiMetricsTest
Change-Id: I3c545e0b6ee0d11a5728853959e5a60fcc3418ea
2 files changed