Removed dependency on `libkeymint_vts_test_utils`.

Test: mmm system/security/keystore2/test_utils/; mmm system/security/keystore2/tests;
atest keystore2_client_tests; atest keystore2_test_utils_test; atest keystore2_test; atest keystore2_legacy_blobs_test;
Bug: 194359114

Change-Id: I2e17697c8ea54b1c38e128b32b4d30f1214c51fc
3 files changed