drivers: wifi: siwx91x: Correct handling of BSSID in interface status

This commit resolves incorrect results in the interface status response.
The parameter for `sl_wifi_get_wireless_info` has changed following the
HAL Silabs update to version 3.5.0.

In AP mode, the implementation now correctly uses the `mac_address`
variable instead of `bssid`.

Signed-off-by: Arunmani Alagarsamy <arunmani.a@silabs.com>