KeyMint VTS: improve attestation tests

Check that the various ATTESTATION_ID_* tags are included if they
have the correct value, and that keygen fails if they have an invalid
value.

Also update attestation tags to include vendor/boot patchlevel if
they're available. (They always should be, but fixing that is a
separate task.)

Bug: 190757200
Test: VtsAidlKeyMintTargetTest
Merged-In: Ibaed7364c6d08c0982e2a9fb6cb864ae42cf39fe
Change-Id: Ibaed7364c6d08c0982e2a9fb6cb864ae42cf39fe