[Bug 193907] New: [ath] in HT40 mode set the final rate table entry to be 20MHz, just in case HT40 reception is terrible.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193907

            Bug ID: 193907
           Summary: [ath] in HT40 mode set the final rate table entry to
                    be 20MHz, just in case HT40 reception is terrible.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: adrian at freebsd.org

It may be that transmitting 40MHz rates (eg in HT40 2GHz mode) performs really
crappy due to adjacent channel interference.

So:

* teach ath_rate_sample to set the 20MHz flag for the final rate in the rate
table, so there's at least a good fallback
* .. and then maybe have it track how good 20/40 rates are and if too many
fallbacks to 20MHz is done, just fallback to transmitting on 20MHz for a while.

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