Rename GetOutOfBandData -> GetLeOutOfBandData

Currently, this function is only used by cert tests.
This rename is a stopgap until it is dropped from the
FacadeConfigurationApi interface in favor of the SecurityManager
interface.

Bug: 162984360
Tag: #gd-refactor
Test: cert/run --host SecurityTest:test_successful_dut_initiated_ssp_oob
Test: cert/run --host LeSecurityTest
Change-Id: Ib1a79de46d3a59ec1c14338e8328718d114aed2a