wifi: mac80211: update UHR capabilities field order

wifi: mac80211: update UHR capabilities field order

Since 802.11bn D1.4 the DBE capabilities are after the
PHY capabilities, not between MAC and PHY, adjust the
code accordingly.

Also add a struct for DBE capabilities and use it for
checking the correct length instead of hard-coding the
lengths.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260428103657.b40af50f182d.I75306a092dc2c8a9eb7276160f0b7144b4846d18@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>