wifi: mac80211: parse A-MSDU len from EHT capabilities

On 2.4 GHz there's no VHT, so EHT defines its own bits for
the maximum MPDU length. Parse and store them in the link_sta.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241007144851.e05da59c419a.I0b1c047639160d9a96f48ab013c18ea33f5473b0@changeid


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