imgtool: Enable ed25519 getpub tests

Enable previously ignored getpub tests for ed25519

Signed-off-by: Rustam Ismayilov <rustam.ismayilov@arm.com>
Change-Id: I84ebfb535e246bfe5dedd2acc6090a9b10e91103

scripts/tests/conftest.py

@@ -27,12 +27,6 @@
  "tests/test_keys.py::TestGetPriv::test_getpriv_with_password[pkcs8-rsa-2048]",
  "tests/test_keys.py::TestGetPriv::test_getpriv_with_password[pkcs8-rsa-3072]",
  "tests/test_keys.py::TestGetPriv::test_getpriv_with_password[pkcs8-ed25519]",
- # 'Ed25519' object has no attribute 'get_public_pem'
- "tests/test_keys.py::TestGetPub::test_getpub[pem-ed25519]",
- "tests/test_keys.py::TestGetPub::test_getpub_with_encoding[pem-ed25519]",
- "tests/test_keys.py::TestGetPub::test_getpub_no_outfile[pem-ed25519]",
- "tests/test_keys.py::TestLoading::test_load_key_public[pem-ed25519]",
- "tests/test_keys.py::TestLoading::test_load_key_public_with_password[pem-ed25519]",
 }