cfg80211: fix default HE tx bitrate mask in 2G band

[ Upstream commit 9df66d5b ]

In 2G band, a HE sta can only supports HT and HE, but not supports VHT.
In this case, default HE tx bitrate mask isn't filled, when we use iw to
set bitrates without any parameter.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20210609075944.51130-1-pkshih@realtek.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>