drivers: wifi/airoc: Update cb_search to check SSID length

Issue:
When there are two similar SSIDs (e.g. MySSID and MySSID_Guest),
the current implementation may use the wrong (truncated) SSID
for the connection. See issue#74910 for details.

Fix:
Updated airoc_wifi_scan_cb_search to filter all SSID where
length is different than the user-entered SSID.

Signed-off-by: Nazar Palamar <nazar.palamar@infineon.com>