WiFi: Basic support for 11be to Hostapd HAL

In this commit, basic support for 11be is added to HostApd HAL.
That includes:
1. Adding 320MHz bandwidth channels
2. Adding 11be to list of standards
3. Add a flag to enable/disable 11be for SoftAp

Bug: 198746544
Test: Pass VTS tests, and presubmit tests
Change-Id: I14e1bd8ab00692e743a3a49096fbd66aca806730