OemLockService: remove canUserAllowOemUnlock()

No longer used by Settings as the logic was wrong.

Test: gts-tradefed run gts -m GtsOemLockServiceTestCases
Bug: 65124732
Change-Id: I44e5f697aabd2b5eefecf64060502b5c9ef5f911
(cherry picked from commit d37fe2d3e1cbf03161df9f4e16f791a99445cdc1)
3 files changed