Replace COMMON_CRITERIA_MODE setting with getter API

Per API review feedback, global settings are discouraged in favour
of fine-grained getter APIs.

Bug: 149999040
Test: atest AdapterServiceTest
Test: atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testCommonCriteriaMode
Test: atest com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testCommonCriteriaMode
Change-Id: I4775c644166b1683d75c08a848ff6a713ccf21fa