Support abortScan

Support to abortScan instead of "ABORT_SCAN" command of
wpa_supplicant.
When STA scan triggered by wificond is ongoing, abortScan sends
NL80211_CMD_ABORT_SCAN to kernel to stop it.

Bug: 37227357
Test: Manual test

Change-Id: Ifc4b81de8ec1d75467edf497abfe348c4ce1b283
5 files changed