WiFi: Extend SAR to support sap/scan-only modes

This commit is part of the feature of extending SAR Support in WiFi.
It adds support for both AP and Scan-Only modes.

This commit also adds some more general tests for SarManager class.

Bug: 65174506
Test: Run Wifi unit test suite
Test: ./frameworks/opt/net/wifi/tests/wifitests/runtests.sh

Change-Id: I04b61aaf69308600919c5f6e9ea61be130be9750
Signed-off-by: Ahmed ElArabawy <arabawy@google.com>
7 files changed