In the WifiTetherApBandController the incorrect method was
being called to check if the device is 5Ghz compatible. We
were calling is5GhzBandSupported directly, but we were
supposed to call isDualBandSupported instead.
Test: robotests updated
Bug: 110793581
Change-Id: I61d3ff10abedde6196b8e29591ebfd3272dbbcd9