wifi: mac80211: fix MPDU length parsing for EHT 5/6 GHz

wifi: mac80211: fix MPDU length parsing for EHT 5/6 GHz

The MPDU length is only configured using the EHT capabilities element on
2.4 GHz. On 5/6 GHz it is configured using the VHT or HE capabilities
respectively.

Fixes: cf0079279727 ("wifi: mac80211: parse A-MSDU len from EHT capabilities")
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20250311121704.0634d31f0883.I28063e4d3ef7d296b7e8a1c303460346a30bf09c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>