Active Link Probing: Generic API to send 802.11 management frames

Created a generic API to send arbitrary 802.11 management frames, and
receive a notification when the frame was ACKed or an error occurred.
Use this new API to send a minimal probe request frame to the AP in
order to assess Wifi connection quality.

Bug: 112029045
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Test: Manually trigger link probe
Change-Id: I0553770ae88954e8335ed4bbe7682ec7fa09aa51
6 files changed