wifi: iwlwifi: mld: add duplicated beacon RSSI adjustment

wifi: iwlwifi: mld: add duplicated beacon RSSI adjustment

For 6 GHz duplicated beacons, the RSSI is measured only on the 20 MHz
primary channel while the actual beacon energy spans the full
operational bandwidth. This leads to underestimated link quality.

Detect duplicated beacons and apply bandwidth-based RSSI adjustments.

Signed-off-by: Avinash Bhatt <avinash.bhatt@intel.com>
Link: https://patch.msgid.link/20260512222731.a4c873e63054.Iea8e8a5f3b384622308dd8d03c5881ff75f1908c@changeid
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>