bluetooth: host: convert conn address on identity resolution

Fix an issue in the CCC configuration when the Peripheral device
maintains two or more distinct connections on different identities
with the same peer. The issue occurs when the local device performs
the pairing and the bonding procedure on a connection associated
with one of the Bluetooth identities. During the identity resolution,
the peer address field in the CCC descriptor is converted from the
RPA-type address to the Identity Address. However, the destination
address on the remaining connection objects associated with other
Bluetooth identities is not converted. Due to this, their CCC
configuration is reset and GATT indications and notification fail
to be sent even if the Central device subscribed to them.

Added necessary code to iterate over all connection objects during
the identity resolution phase and aligned their destination address
from the RPA-type to the Identity Address.

Signed-off-by: Kamil Piszczek <Kamil.Piszczek@nordicsemi.no>