Validating key characteristics of generated/imported keys.

Updated VTS tests to verify mgf-digests in key characteristics of
RSA-OAEP keys. Added new tests to import RSA-OAEP keys with
mgf-digests and verified imported key characteristics.

Bug: 279721313
Test: atest VtsAidlKeyMintTargetTest
Change-Id: I06474a85c9e77fded264031ff5636f2c35bee6b4
4 files changed