UPSTREAM: wifi: mac80211: don't parse mbssid in assoc response

This is simply not valid and simplifies the next commit.
11;rgb:ffff/ffff/ddddI'll make a separate patch for this in the current main
tree as well.

Bug: 254180332
Bug: 256773215
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <joneslee@google.com>
(cherry picked from commit 353b5c8d)
Change-Id: Ie554c036923c94b125035141a3bffafc129a5aa6