wifi: cfg80211: validate HE operation element parsing

Validate that the HE operation element has the correct
length before parsing it.

Cc: stable@vger.kernel.org
Fixes: 645f3d85

 ("wifi: cfg80211: handle UHB AP and STA power type")
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240523120533.677025eb4a92.I44c091029ef113c294e8fe8b9bf871bf5dbeeb27@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>