Introduce vendor header for selfManaged dialog

Test: Test: atest CtsCompanionDeviceManagerCoreTestCases
      atest CtsCompanionDeviceManagerUiAutomationTestCases
      atest CtsOsTestCases:CompanionDeviceManagerTest
Bug: 216638097
Change-Id: Ib73b17c81bf9ac0cc7a98459cffbd9a233c9fbe5
9 files changed