This make LE and BR/EDR keys store in separate storages. This is
to simplify handling of dual mode device handling where identity
information are distributed after LTK. BR/EDR has only one key
(Link Key) so this transport specific code can be further simplified.
Change-Id: I8f45d4491ce613aaac11f1d60cf42c38fc3eceec
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>