nl80211: Avoid NL80211_WPA_VERSION_3 on older kernel versions

nl80211: Avoid NL80211_WPA_VERSION_3 on older kernel versions

NL80211_WPA_VERSION_3 was only added in kernel 5.2 so it should not be
set for older kernel versions.  There is no direct way to check if the
value is supported. However, we can use the new infrastructure to check
whether the kernel has the NL80211_ATTR_SAE_PASSWORD attribute. It is
related and was added at the same time.

Fixes: 6cc78b3945d3 ("nl80211: Set NL80211_WPA_VERSION_2 vs. _3 based on AKM")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>