cfg80211: Support configuration of station EHT capabilities

Add attributes and some code bits to support userspace passing
in EHT capabilities of stations.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Link: https://lore.kernel.org/r/20220214173004.ecf0b3ff9627.Icb4a5f2ec7b41d9008ac4cfc16c59baeb84793d3@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>