Separate general and token specific code

Change-Id: I36f19eb2583398c2badcf7b078684412ed99922b
Signed-off-by: Mate Toth-Pal <mate.toth-pal@arm.com>
diff --git a/iat-verifier/iatverifier/util.py b/iat-verifier/iatverifier/util.py
index 9418721..39af2e3 100644
--- a/iat-verifier/iatverifier/util.py
+++ b/iat-verifier/iatverifier/util.py
@@ -16,7 +16,7 @@
 from pycose.attributes import CoseAttrs
 from pycose.sign1message import Sign1Message
 from pycose.mac0message import Mac0Message
-from iatverifier.verifiers import AttestationTokenVerifier
+from iatverifier.attest_token_verifier import AttestationTokenVerifier
 from cbor2 import CBORTag
 
 _logger = logging.getLogger("util")