Uses existing *_sync functions

mgmt-test paths:
Read Local OOB Ext Data - Invalid index
Read Local OOB Ext Data - Legacy pairing
Read Local OOB Ext Data - Success SSP
Read Local OOB Ext Data - Success SC
Signed-off-by: Brian Gix <brian.gix@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>