wifi: mac80211: fix station NSS capability initialization order

Station's spatial streaming capability should be initialized before
handling VHT OMN, because the handling requires the capability information.

Fixes: a8bca3e9 ("wifi: mac80211: track capability/opmode NSS separately")
Signed-off-by: Benjamin Lin <benjamin-jw.lin@mediatek.com>
Link: https://patch.msgid.link/20241118080722.9603-1-benjamin-jw.lin@mediatek.com


[rewrite subject]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>