Bluetooth: hci_event: Rework hci_inquiry_result_with_rssi_evt

This rework the handling of hci_inquiry_result_with_rssi_evt to not use
a union to represent the different inquiry responses.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Tested-by: Soenke Huster <soenke.huster@eknoes.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>