Bluetooth: MGMT: Ignore keys being loaded with invalid type

Due to 59b047bc there could be keys stored
with the wrong address type so this attempt to detect it and ignore them
instead of just failing to load all keys.

Cc: stable@vger.kernel.org
Link: https://github.com/bluez/bluez/issues/875


Fixes: 59b047bc ("Bluetooth: MGMT/SMP: Fix address type when using SMP over BREDR/LE")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>