UPSTREAM: cfg80211: fix 6 GHz channel conversion

We shouldn't accept any channels bigger than 233, fix that.

Reported-by: Amar <asinghal@codeaurora.org>
Fixes: d1a1646c0de7 ("cfg80211: adapt to new channelization of the 6GHz band")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20200917115222.312ba6f1d461.I3a8c8fbcc3cc019814fd9cd0aced7eb591626136@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
(cherry picked from commit c0de8776af6543e10d1a5c8969679fd9f6b66fa9)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I83a88dce9a0c78f949abd792c824ed6f923ee809