Bluetooth: Classic: SMP: Derived LE keys are not handled correctly

The derived LE keys are not saved to NVM. And the IRK is not added to
controller resolving list. It causes two issues,
Issue 1, the LE connection connection cannot be established if the adv
address of peer is RPA.
Issue 2, the LE keys are missing after the power reset.

For issue 1, add a function `smp_br_id_add_replace` to add LE keys.
For issue 2, check the BR bondable flag `BT_CONN_BR_NOBOND` instead of
`SMP_FLAG_BOND`.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>