Disabled testSetKeyguardDisabledFeatures tests for headless system user DO. The headless system user cannot be locked, so this tests only applies to the profile owner. Test: atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSetKeyguardDisabledFeatures Fixes: 189266448 Bug: 192395248 Change-Id: I6a28c14c92da880e8f519913825735a0dab10f40