cfg80211: Add phyrate conversion support for extended MCS in 60GHz band

The current phyrate conversion does not include extended MCS and provides
incorrect rates. Add a flag for extended MCS in DMG and add corresponding
phyrate table for the correct conversions using base MCS in DMG specs.

Signed-off-by: Max Chen <mxchen@codeaurora.org>
Link: https://lore.kernel.org/r/1609977050-7089-2-git-send-email-mxchen@codeaurora.org


[reduce data size, make a single WARN]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>