Bluetooth: Use identity address to look up for connections
Bluetooth: Use identity address to look up for connections

If we have IRK stored for device we try to connect to,
it means we should look up bt_conn based on identity address,
not the address from advertising or connection complete event.

Change-Id: Iccbd766acf9a62cfe5e967cf54597854881f37d5
Signed-off-by: Mariusz Skamra <c73850bd0bf85e95dce44c2ce1418ca55c1b6c5d@tieto.com>

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