Fix ClipboardService device lock check for cross profile

ClipboardService.isDeviceLocked should clear callingIdentity before
accessing KeyguardManager.

Test: bit CtsDevicePolicyManagerTestCases:com.android.cts.devicepolicy.ManagedProfileTest

Bug: 64934810
Change-Id: Iffc8e73dd3ee14a94958bb50dd11a696eab7f052
1 file changed