wifi: add basic support for 60GHz band

Add ScanResult.is60GHz() helper function which returns true if the frequency
belongs to the 60GHz band.

Add scans60GHz for additional scan info shown when Wifi verbose logging is
enabled.

Add definition of AP_BAND_60GHZ that is used for 60GHz SoftAP.

Bug: 145337375
Test: Manual - enable wifi and connect to an access point
Test: atest FrameworksWifiTests
Test: atest FrameworksWifiApiTests
Change-Id: Ie616bb815a27c053bec0c1056616be6123822be6