Add more vts tests related to limited use key.

1. Fix test case for usage count limit tag = 1 case, when
  hardware cannot enforce it, the tag should by enforced by keystore.
2. Add test case for usage count limit tag > 1.
3. Add test case to verify the usage count limit tag appears
  correctly in the attestation certificate for asymmetic key.

Test: atest -c VtsAidlKeyMintTargetTest

Change-Id: I01df278b42a91a78c8888c13c4f81b7ec70cfa22